Revert "Update requirements-tests.txt"
Revert "Update requirements-tests.txt"

incompatible with pytest-cov

This reverts commit 24bf731975eb139d8ea641d8850cb01ac00c3deb.

okin/nikola,masayuko/nikola,andredias/nikola,getnikola/nikola,okin/nikola,x1101/nikola,x1101/nikola,gwax/nikola,gwax/nikola,okin/nikola,masayuko/nikola,gwax/nikola,s2hc-johan/nikola,s2hc-johan/nikola,s2hc-johan/nikola,wcmckee/nikola,xuhdev/nikola,knowsuchagency/nikola,getnikola/nikola,atiro/nikola,getnikola/nikola,wcmckee/nikola,xuhdev/nikola,knowsuchagency/nikola,masayuko/nikola,getnikola/nikola,atiro/nikola,wcmckee/nikola,x1101/nikola,knowsuchagency/nikola,andredias/nikola,okin/nikola,atiro/nikola,xuhdev/nikola,andredias/nikola,xuhdev/nikola