Add branch alias from dev-master to 0.1.x-dev

This is a best practice described here: https://getcomposer.org/doc/articles/aliases.md

I hope it would resolve the problem with requiring `dev-master` from one package and `0.1.*` from another one.

This problem is described in the Composer docs with:

> If anyone wants to require the latest dev-master, they have a problem: Other packages may require `1.0.*`, so requiring that dev version will lead to conflicts, since dev-master does not match the `1.0.*` constraint.