Update versioneer to 0.29

[jwodder]

Closes #109.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.72%. Comparing base (b722541) to head (ce42e04).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   90.72%   90.72%           
=======================================
  Files          10       10           
  Lines         604      604           
=======================================
  Hits          548      548           
  Misses         56       56           

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[yarikoptic]

Thanks ! Let's see if that fixes it