chore(package): update webpack to version 3.5.2

Author: greenkeeper[bot]

package.json

@@ -36,6 +36,6 @@
     "mocha": "^3.5.0",
     "mocha-lcov-reporter": "^1.2.0",
     "recursive-readdir-sync": "^1.0.6",
-    "webpack": "^3.4.1"
+    "webpack": "^3.5.2"
   }
 }