fix(package): update @babel/plugin-syntax-dynamic-import to version 7.7.4

Closes #251

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
   ],
   "dependencies": {
     "@babel/core": "7.7.5",
-    "@babel/plugin-syntax-dynamic-import": "7.2.0",
+    "@babel/plugin-syntax-dynamic-import": "7.7.4",
     "@babel/plugin-syntax-object-rest-spread": "7.2.0",
     "@babel/preset-env": "7.6.2",
     "@babel/register": "7.6.2",