Bump version to 306

This should be done _immediatelly_ after branching off `rel-`.
Duplicate entries in dictionnary
Newlines at EOF + a typo in basher I got tired of looking at
Weak warnings in bosh

Triple double-quoted strings should be used for docstrings
dictionary creation could be rewritten as a dictionary literal
Weak warns 2: Comparison with None performed with equality operators
Merge branch 'utumno-pycharm-warnings' into dev