Pytest 5 🎉

Also updates the Pytest command in `run_tests.sh` to remove junit,
which we stopped using.

requirements_for_test.txt

@@ -1,10 +1,10 @@
 -r requirements.txt
 isort==4.3.21
-pytest==3.10.1  # pyup: <4.0.0
+pytest==5.3.2
 pytest-env==0.6.2
 pytest-cov==2.8.1
 pytest-mock==1.11.2
-pytest-xdist==1.27.0 # pyup: <1.28.0
+pytest-xdist==1.31.0
 beautifulsoup4==4.8.1
 freezegun==0.3.12
 flake8==3.7.9

scripts/run_tests.sh

@@ -37,5 +37,5 @@ npm test
 display_result $? 3 "Javascript tests have"
 
 ## Code coverage
-py.test -n auto --maxfail=10 --cov=app --cov-report=term-missing tests/ --junitxml=test_results.xml --strict -p no:warnings
+py.test -n auto --maxfail=10 --cov=app --cov-report=term-missing tests/ --strict -p no:warnings
 display_result $? 4 "Code coverage"