Also test pybtex from git.

[mcmtroffaes]

As discussed in #16.

[codecov]

Codecov Report

Merging #19 (0091efc) into develop (14def3e) will not change coverage.
The diff coverage is n/a.

❗ Current head 0091efc differs from pull request most recent head b926194. Consider uploading reports for the commit b926194 to get more accurate results

@@            Coverage Diff            @@
##           develop       #19   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          100       100           
=========================================
  Hits           100       100           

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