psynteract v0.8.0: Now with extra bling

This release makes the API more user-friendly, and fixes a bug that affected client synchronization. Thanks to Hosam Alqaderi for pointing it out!

Version 0.8 is probably one of the last pre-releases before the library reaches version 1.0. The library has been battle-tested and should be stable, which is why we've removed the pre-release flag.