fix for #409

[jbogaardt]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 71.42% and project coverage change: -0.04 ⚠️

Comparison is base (25279a1) 81.79% compared to head (62d66f0) 81.76%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #432      +/-   ##
==========================================
- Coverage   81.79%   81.76%   -0.04%     
==========================================
  Files          80       80              
  Lines        4718     4721       +3     
  Branches      804      805       +1     
==========================================
+ Hits         3859     3860       +1     
- Misses        657      658       +1     
- Partials      202      203       +1     

Flag	Coverage Δ
unittests	81.76% <71.42%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
chainladder/core/tests/test_grain.py	100.00% <ø> (ø)
chainladder/core/triangle.py	88.86% <66.66%> (-0.41%)	⬇️
chainladder/__init__.py	76.47% <100.00%> (ø)

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