Merge pull request #25 from dmuhs/pyup-update-pytest-5.4.1-to-5.4.2

Update pytest to 5.4.2

requirements_dev.txt

@@ -10,7 +10,7 @@ Sphinx==3.0.3
 sphinx-rtd-theme==0.4.3
 twine==3.1.1
 
-pytest==5.4.1
+pytest==5.4.2
 pytest-runner==5.2
 pytest-cov==2.8.1
 requests-mock==1.8.0