diff --git a/package-lock.json b/package-lock.json
index 9fc5a31..ea714ed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,7 +23,7 @@
         "chai": "^3.5.0",
         "chai-as-promised": "7.1.1",
         "eslint": "^4.19.1",
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+        "mocha": "6.2.3",
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@@ -541,7 +541,7 @@
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       "dev": true,
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@@ -1372,28 +1372,31 @@
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-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
-      "dev": true
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
     },
     "node_modules/mkdirp": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.4.tgz",
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       "deprecated": "Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)",
       "dev": true,
       "dependencies": {
-        "minimist": "0.0.8"
+        "minimist": "^1.2.5"
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     "node_modules/mocha": {
-      "version": "6.2.2",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.2.tgz",
-      "integrity": "sha512-FgDS9Re79yU1xz5d+C4rv1G7QagNGHZ+iXF81hO8zY35YZZcLEsJVfFolfsqKFWunATEvNzMK0r/CwWd/szO9A==",
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.3.tgz",
+      "integrity": "sha512-0R/3FvjIGH3eEuG17ccFPk117XL2rWxatr81a57D+r/x2uTYZRbdZ4oVidEUMh2W2TJDa7MdAb12Lm2/qrKajg==",
       "dev": true,
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@@ -1408,7 +1411,7 @@
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         "log-symbols": "2.2.0",
         "minimatch": "3.0.4",
-        "mkdirp": "0.5.1",
+        "mkdirp": "0.5.4",
         "ms": "2.1.1",
         "node-environment-flags": "1.0.5",
         "object.assign": "4.1.0",
@@ -1416,8 +1419,8 @@
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         "which": "1.3.1",
         "wide-align": "1.1.3",
-        "yargs": "13.3.0",
-        "yargs-parser": "13.1.1",
+        "yargs": "13.3.2",
+        "yargs-parser": "13.1.2",
         "yargs-unparser": "1.6.0"
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@@ -2278,9 +2281,9 @@
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
-      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
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@@ -2292,13 +2295,13 @@
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         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
+        "yargs-parser": "^13.1.2"
       }
     },
     "node_modules/yargs-parser": {
-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "dependencies": {
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@@ -2779,7 +2782,7 @@
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       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "integrity": "sha512-z2S+W9X73hAUUki+N+9Za2lBlun89zigOyGrsax+KUQ6wKW4ZoWpEYBkGhQjwAjjDCkWxhY0VKEhk8wzY7F5cA==",
       "dev": true
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@@ -3439,24 +3442,24 @@
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-      "version": "0.0.8",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
       "dev": true
     },
     "mkdirp": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.4.tgz",
+      "integrity": "sha512-iG9AK/dJLtJ0XNgTuDbSyNS3zECqDlAhnQW4CsNxBG3LQJBbHmRX1egw39DmtOdCAqY+dKXV+sgPgilNWUKMVw==",
       "dev": true,
       "requires": {
-        "minimist": "0.0.8"
+        "minimist": "^1.2.5"
       }
     },
     "mocha": {
-      "version": "6.2.2",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.2.tgz",
-      "integrity": "sha512-FgDS9Re79yU1xz5d+C4rv1G7QagNGHZ+iXF81hO8zY35YZZcLEsJVfFolfsqKFWunATEvNzMK0r/CwWd/szO9A==",
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.3.tgz",
+      "integrity": "sha512-0R/3FvjIGH3eEuG17ccFPk117XL2rWxatr81a57D+r/x2uTYZRbdZ4oVidEUMh2W2TJDa7MdAb12Lm2/qrKajg==",
       "dev": true,
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@@ -3471,7 +3474,7 @@
         "js-yaml": "3.13.1",
         "log-symbols": "2.2.0",
         "minimatch": "3.0.4",
-        "mkdirp": "0.5.1",
+        "mkdirp": "0.5.4",
         "ms": "2.1.1",
         "node-environment-flags": "1.0.5",
         "object.assign": "4.1.0",
@@ -3479,8 +3482,8 @@
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         "which": "1.3.1",
         "wide-align": "1.1.3",
-        "yargs": "13.3.0",
-        "yargs-parser": "13.1.1",
+        "yargs": "13.3.2",
+        "yargs-parser": "13.1.2",
         "yargs-unparser": "1.6.0"
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@@ -4182,9 +4185,9 @@
       "dev": true
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
-      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
       "requires": {
         "cliui": "^5.0.0",
@@ -4196,7 +4199,7 @@
         "string-width": "^3.0.0",
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
+        "yargs-parser": "^13.1.2"
       },
       "dependencies": {
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@@ -4228,9 +4231,9 @@
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-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
diff --git a/package.json b/package.json
index 413d888..fa3d953 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "chai": "^3.5.0",
     "chai-as-promised": "7.1.1",
     "eslint": "^4.19.1",
-    "mocha": "6.2.2",
+    "mocha": "6.2.3",
     "sinon": "^1.17.6"
   },
   "dependencies": {