Only look at _version_git in immediate subdirs

[thomascobb]

Fixes #31

[codecov]

Codecov Report

Merging #32 (3618d94) into master (30f5e0d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   85.67%   85.67%           
=======================================
  Files          13       13           
  Lines         803      803           
=======================================
  Hits          688      688           
  Misses        115      115           

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