Update browserify

Closes GH-1.

Author: greenkeeperio-bot

package.json

@@ -20,7 +20,7 @@
   ],
   "dependencies": {},
   "devDependencies": {
-    "browserify": "^13.0.0",
+    "browserify": "^14.0.0",
     "esmangle": "^1.0.0",
     "istanbul": "^0.4.0",
     "remark-cli": "^2.1.0",