v0.2.0

New features:

- show stashes
- backward compatability to python 3.5
- backward compatability to urwid 2.0.1 by clipping lines instead of wrapping them
- show "decoration" (references) in details view

Bugfixes:

- exit gracefully if outside of git repository
- exit gracefully if python is too old
- don't crash if there are no commits yet
- avoid error message "no such command: cursor"
- avoid error message "no such keyboard shortcut j/k"
- don't display align character
- don't crash if align character is first or last character
- recognize short hashes with more (or less) than seven characters

Other changes:

- `yy` copies internally used id
- new optional requirement to packaging library
  (see c4434c6afe970a0a11511f8abd9db8e1ff502f56)