Merge branch 'MisterBiggs-master-patch-42928' into 'master'

Update .gitlab-ci.yml, requirements.txt files

See merge request MisterBiggs/aero-astro-calc!2

.gitlab-ci.yml

@@ -1,5 +1,20 @@
 stages:
   - deploy
+  - test
+
+
+black:
+  stage: test
+  image: python:3.8
+
+  before_script:
+    - python -V
+    - pip install -U black==19.10b0
+
+  script:
+    - black .
+
+
 # https://github.com/python-gitlab/python-gitlab/blob/master/.gitlab-ci.yml used for reference
 deploy:
   stage: deploy