release 0.6.1

[chfw]

• 🐛 fix broken git repo support where gitfs2 is not installed

• ✨ really to be backward compactible, it is to have pypifs and gitfs2 installed

Before raising the PR, here is a check list:

• have you written unit tests for your code changes?
• have you updated the change log?
• can someone else understand your changes without your explanation?
• are you proud of your code changes?
• please add your name and github link to contributors.rst in alphabetical order.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@f5d36ec). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #330   +/-   ##
=========================================
  Coverage          ?   95.36%           
=========================================
  Files             ?       51           
  Lines             ?     2547           
  Branches          ?        0           
=========================================
  Hits              ?     2429           
  Misses            ?      118           
  Partials          ?        0

Impacted Files	Coverage Δ
moban/_version.py	100% <100%> (ø)

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