chore(package): update browserify to version 15.1.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "babel-minify": "^0.2.0",
-    "browserify": "^14.4.0",
+    "browserify": "^15.1.0",
     "budo": "^10.0.4",
     "cz-conventional-changelog": "^2.0.0",
     "husky": "^0.14.3",