release version 1.3.1

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[codecov[bot]]

Codecov Report

Merging #518 (438b2f6) into master (72bb820) will decrease coverage by 5.54%. The diff coverage is n/a.

:exclamation: Current head 438b2f6 differs from pull request most recent head 64bec0e. Consider uploading reports for the commit 64bec0e to get more accurate results

@@            Coverage Diff             @@
##           master     #518      +/-   ##
==========================================
- Coverage   95.92%   90.39%   -5.54%     
==========================================
  Files          45       45              
  Lines        1916     1916              
  Branches      276      276              
==========================================
- Hits         1838     1732     -106     
- Misses         56      143      +87     
- Partials       22       41      +19     

see 11 files with indirect coverage changes