diff --git a/package-lock.json b/package-lock.json
index 1be093f..bcd10b8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -36,13 +36,51 @@
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       "dev": true,
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+        "sprintf-js": "~1.0.2"
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@@ -63,10 +101,16 @@
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-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
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+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
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@@ -75,6 +119,12 @@
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+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
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@@ -92,6 +142,61 @@
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       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
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+      "dev": true,
+      "requires": {
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+        "class-utils": "^0.3.5",
+        "component-emitter": "^1.2.1",
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+          "dev": true,
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+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
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+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
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@@ -129,31 +235,55 @@
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-      "dev": true
+    "braces": {
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+      "resolved": "https://registry.npmjs.org/braces/-/braces-2.3.2.tgz",
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+      "dev": true,
+      "requires": {
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+        "array-unique": "^0.3.2",
+        "extend-shallow": "^2.0.1",
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+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+          "dev": true,
+          "requires": {
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-      "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
+    "cache-base": {
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+      "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
+      "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
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-        "camelcase": "2.1.1",
-        "map-obj": "1.0.1"
+        "collection-visit": "^1.0.0",
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@@ -174,6 +304,29 @@
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+      "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
+      "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
+      "dev": true,
+      "requires": {
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+        "define-property": "^0.2.5",
+        "isobject": "^3.0.0",
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+          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
+          "dev": true,
+          "requires": {
+            "is-descriptor": "^0.1.0"
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@@ -188,10 +341,29 @@
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-      "integrity": "sha1-56qDAZF+9iGzXYo580jc3R234z4=",
+    "collection-visit": {
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+      "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
+      "integrity": "sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=",
+      "dev": true,
+      "requires": {
+        "map-visit": "^1.0.0",
+        "object-visit": "^1.0.0"
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+    "color-convert": {
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+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dev": true,
+      "requires": {
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+    "color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
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@@ -204,10 +376,17 @@
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       "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==",
+      "dev": true
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       "integrity": "sha1-vXJ6f67XfnH/OYWskzUakSczrQ8="
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+      "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
+      "integrity": "sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=",
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-      "dev": true,
-      "requires": {
-        "get-stdin": "4.0.1",
-        "meow": "3.7.0"
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+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-3.0.3.tgz",
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+      "dev": true
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@@ -277,16 +449,64 @@
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-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+    "decode-uri-component": {
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+      "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
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+      "dev": true,
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+        "isobject": "^3.0.1"
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+          "dev": true,
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
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+          "dev": true,
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+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
+          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
+          "dev": true,
+          "requires": {
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+            "is-data-descriptor": "^1.0.0",
+            "kind-of": "^6.0.2"
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-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
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@@ -320,24 +540,15 @@
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-      "integrity": "sha1-luO3DVd59q1JzQMmc9HDEnZ7pYE=",
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+      "integrity": "sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=",
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@@ -1469,10 +2500,90 @@
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+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
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-      "integrity": "sha1-gGmSYzZl1eX8tNsfs6hi62jp5to=",
+      "version": "3.3.5",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
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+      "dev": true,
+      "requires": {
+        "sprintf-js": "^1.0.3",
+        "util-deprecate": "^1.0.2"
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+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
+      "dev": true,
+      "requires": {
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+        "get-value": "^2.0.6",
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+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
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+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
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+              "dev": true,
+              "requires": {
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+        "has-values": {
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+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        }
+      }
+    },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
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+    "use": {
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+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
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+    "util-deprecate": {
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+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
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@@ -1481,14 +2592,13 @@
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-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
-      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
+    "v8flags": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
+      "integrity": "sha512-amh9CCg3ZxkzQ48Mhcb8iX7xpAfYJgePHxWMQCBWECpOSqJUXgY26ncA61UTV0BkPqfhcy6mzwCIoP4ygxpW8w==",
       "dev": true,
       "requires": {
-        "spdx-correct": "3.0.0",
-        "spdx-expression-parse": "3.0.0"
+        "homedir-polyfill": "^1.0.1"
       }
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@@ -1525,12 +2635,12 @@
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-      "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
-      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
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       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
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diff --git a/package.json b/package.json
index 3e478c0..76064c3 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
   },
   "homepage": "https://github.com/rtcoder/WebDraft#readme",
   "devDependencies": {
-    "grunt": "^1.0.2"
+    "grunt": "^1.3.0"
   },
   "dependencies": {
     "grunt-contrib-concat": "^1.0.1",