First stable release v0.1

It's well tested on real react project. The only dependency.

Covers two rules:

• uses-react

  Prevent React to be incorrectly marked as unused

• uses-vars

  Prevent variables used in pugjs to be incorrectly marked as unused

Why not 1.0.0 version

I'm going to cover some more options (will create a milestone on github to describe them) before moving this project with semver.