chore(package): update webpack to version 4.25.0

Closes #45

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "jest": "^23.6.0",
     "prettier": "1.14.3",
     "uuid": "3.3.2",
-    "webpack": "4.23.0",
+    "webpack": "4.25.0",
     "jest-cli": "^23.6.0"
   }
 }