Bump version to 0.4.1 

Bump version to 0.4.0 

Bump version to 0.3.7 

Merge pull request tjardoo#41 from tjardoo/fix-unwrap-missing-headers… …-exception Fix unwrap missing headers exception

Bump version to 0.3.5 

Bump version to 0.3.4 

Bump version to 0.3.3 

Update docs 

Merge pull request tjardoo#27 from tjardoo/assistant Assistants API

Merge pull request tjardoo#26 from tjardoo/0.3 Version 0.3