Update to browserify@16

Fixes #354

Author: feross

package.json

@@ -6,7 +6,7 @@
   "bin": "bin/cmd.js",
   "dependencies": {
     "anymatch": "^1.3.0",
-    "browserify": "^15.2.0",
+    "browserify": "^16.1.0",
     "chokidar": "^1.0.0",
     "defined": "^1.0.0",
     "outpipe": "^1.1.0",