Update npm dependencies (#42)

Author: kunalkapadia

package.json

@@ -55,11 +55,11 @@
     "winston": "^2.1.1"
   },
   "devDependencies": {
-    "babel-cli": "6.5.1",
-    "babel-core": "^6.9.1",
-    "babel-plugin-add-module-exports": "0.1.2",
-    "babel-preset-es2015": "6.5.0",
-    "babel-preset-stage-2": "6.5.0",
+    "babel-cli": "6.14.0",
+    "babel-core": "6.14.0",
+    "babel-plugin-add-module-exports": "0.2.1",
+    "babel-preset-es2015": "6.14.0",
+    "babel-preset-stage-2": "6.13.0",
     "chai": "^3.4.1",
     "commitizen": "^2.8.2",
     "coveralls": "^2.11.6",