chore(npm): remove duplicate fs-extra dependency

package.json

@@ -25,7 +25,6 @@
   },
   "dependencies": {
     "es6-module-loader": "^0.9.2",
-    "fs-extra": "^0.18.0",
     "googleapis": "1.0.x",
     "gulp-insert": "^0.4.0",
     "gulp-modify": "0.0.4",
@@ -57,7 +56,7 @@
     "dgeni": "^0.4.1",
     "dgeni-packages": "^0.10.11",
     "event-stream": "^3.1.5",
-    "fs-extra": "^0.16.4",
+    "fs-extra": "^0.18.0",
     "glob": "^4.0.6",
     "gulp": "^3.8.8",
     "gulp-autoprefixer": "^2.1.0",