Version 2.0.0 release

[mikehazell]

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This PR will be released as v2.0.0

Breaking change:

replace now matches the Javascript String.replace API. It can take a String or a RegExp as the search parameter. If given a string it will only replace the first instance of that string. To replace all instances of a string use the new method replaceAll.

Feature

New method inject.custom takes a method as it's only argument. This method will be called with the entire content of the file as a String and should return a String. Beyond that you can do what ever you want inside custom.

Thanks to Eugene Zhuchenko for that one and for his patience. It took me a while to merge this.

resolves #8 and #5

[mikehazell]

@evanre - I'd love you to have a look over this if you have time and maybe test against an existing project to make sure I'm not breaking anything I didn't expect.

[Darkade]

I've been using this branch for a couple of months of daily testing and it's been working without problems for me 👍🏽