Update pytest to 5.3.2 (#633)

* Update pytest from 5.3.1 to 5.3.2
* pin coverage to stay below 5.0 ref TheKevJames/coveralls-python#203

.github/workflows/python_testing.yml

@@ -27,7 +27,8 @@ jobs:
 
     - name: Perform Testing
       run: |
-        pip install pytest betamax pytest-runner pytest-cov coverage
+        pip install pytest betamax pytest-runner pytest-cov
+        pip install -U coverage\<5.0
         pytest --cov=pykechain tests
 
     - name: Check docs and distribution

requirements.txt

@@ -12,7 +12,7 @@ semver==2.9.0
 PyOpenSSL==19.1.0; python_version <= '2.7'
 
 # testing
-pytest==5.3.1
+pytest==5.3.2
 betamax==0.8.1
 coverage==4.5.4
 pytest-cov==2.8.1