switch to github flow

requiring contributors to submit build changes means that PRs
always conflict.

using any other branch than master as a default branch is confusing
especially on github.

CONTRIBUTING.md

@@ -4,10 +4,11 @@ Prerequisites:
 
 Flow:
 
-- Fork the repository and checkout `develop` branch
+- Fork the repository and checkout `master` branch
 - Run `npm install` to get or update the dependencies
 - Run `npm start` to build `dist/` and `docs/` directories
 - Change JavaScript or LESS files in `src/` directories
-- Once finished, submit a [Pull Request](https://github.com/nostalgiaz/bootstrap-switch/compare/develop...develop). Remember to target `develop` as destination branch
+- Do not commit changes to dist/ or docs/. These will only be built on merge.
+- Once finished, submit a [Pull Request](https://github.com/nostalgiaz/bootstrap-switch/compare/master...master). Remember to target `master` as destination branch
 
 Thank you.