Babel plugin is a devDependency

Author: codepunkt

package.json

@@ -6,7 +6,6 @@
   "author": "Christoph Werner <[email protected]>",
   "license": "MIT",
   "dependencies": {
-    "babel-plugin-transform-builtin-extend": "^1.1.0",
     "fast-json-patch": "^0.5.7",
     "humps": "^1.1.0",
     "lodash": "^4.11.1",
@@ -15,6 +14,7 @@
   "devDependencies": {
     "babel-cli": "^6.7.7",
     "babel-preset-es2015": "^6.6.0",
+    "babel-plugin-transform-builtin-extend": "^1.1.0",
     "bluebird": "^3.3.5",
     "coveralls": "^2.11.9",
     "eslint": "^2.9.0",