Version number increased
because of an "accident" we had to raise the version number from 0.5.0 to 1.1.1. There was an unintentional 1.0.0 release before 0.4.0 at the TER. We noticed this and decreased the version to 0.4.0, but there was a problem with the update manager (which still knows the 1.0.0 release) and the documentation framework. So we had to reraise the version number again and so the actual release is version number 1.1.1.
We hope you aren't as confused as we are right now. :D