Remove vcrpy pinning

[VMRuiz]

Fixes #181

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.02%. Comparing base (b3b2e1d) to head (3823652).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
- Coverage   94.06%   94.02%   -0.04%     
==========================================
  Files          28       28              
  Lines        1954     1958       +4     
==========================================
+ Hits         1838     1841       +3     
- Misses        116      117       +1     

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