chore(README): Remove section on browserify

This section is no longer needed as browserify will evaluate boolean
vars and remove deadcode

README.md

@@ -44,10 +44,6 @@ This is a mirror of Facebook's (FB) [warning](https://github.com/facebook/fbjs/b
 If you believe a feature is missing than please open a feature request [there](https://github.com/facebook/fbjs).
 If it is approved and merged in that this module will be updated to reflect that change, otherwise this module will not change.
 
-## Browserify
-
-When using [browserify](http://browserify.org/), the `browser.js` file will be imported instead of `invariant.js` and browserify will be told to transform the file with [envify](https://github.com/hughsk/envify). The only difference between `browser.js` and `invariant.js` is the `process.env.NODE_ENV` variable isn't cached. This, in combination with envify and (optionally) [uglifyjs](https://github.com/mishoo/UglifyJS), will result in a noop in production environments. Otherwise behavior is as expected. 
-
 ## Use in Production
 
 It is recommended to add [babel-plugin-dev-expression](https://github.com/4Catalyzer/babel-plugin-dev-expression) with this module to remove warning messages in production.