tangentAt fix

[adam-urbanczyk]

Will resolve #640

[codecov]

Codecov Report

Merging #641 (ed41810) into master (d1ebfba) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   93.94%   93.98%   +0.03%     
==========================================
  Files          31       31              
  Lines        6543     6546       +3     
  Branches      713      713              
==========================================
+ Hits         6147     6152       +5     
+ Misses        258      257       -1     
+ Partials      138      137       -1     

Impacted Files	Coverage Δ
cadquery/occ_impl/shapes.py	91.92% <100.00%> (ø)
tests/test_cadquery.py	99.09% <100.00%> (+<0.01%)	⬆️
cadquery/cq.py	89.86% <0.00%> (+0.20%)	⬆️

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[jmwright]

I think this looks good @adam-urbanczyk

Shall I merge?

[adam-urbanczyk]

Done