Bumped the version up to 0.4.1

I couldn't figure out why my changes weren't being pulled down into another
app. This was why. Duh.
Started a changelog
Bumped version to 0.5.0.

Because the 0.4.1 didn't seem to trigger a new download in deps.
Oops. Forgot to update the hex.pm package too.

That's probably why the deps didn't download.
Merge pull request #13 from suranyami/master

Bumped version to 0.4.1, added Changelog