chore(package): update lodash to version 4.15.0 (#2147)

https://greenkeeper.io/ [skip ci]

Author: greenkeeperio-bot

package.json

@@ -47,7 +47,7 @@
     "gulp-filter": "^4.0.0",
     "gulp-tap": "^0.1.3",
     "insight": "~0.8.3",
-    "lodash": "^4.14.1",
+    "lodash": "^4.15.0",
     "semver": "^5.1.0",
     "underscore.string": "^3.1.1",
     "yeoman-generator": "~0.24.1",