chore(dependencies): update browserify + watchify

I am receiving errors running `grunt-browserify@3.2.1` in watch mode `watch=true,keepAlive=false`:

```
(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.
(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.
(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.
(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.
(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.

node.js:0
// Copyright Joyent, Inc. and other Node contributors.
^
RangeError: Maximum call stack size exceeded
```

Upgrading `browserify` and `watchify` to the latest versions fixes the issue.