Update 'buffer' to v5.x

Author: feross

package.json

@@ -25,7 +25,7 @@
     "browser-pack": "^6.0.1",
     "browser-resolve": "^1.11.0",
     "browserify-zlib": "~0.1.2",
-    "buffer": "^4.1.0",
+    "buffer": "^5.0.2",
     "cached-path-relative": "^1.0.0",
     "concat-stream": "~1.5.1",
     "console-browserify": "^1.1.0",