Merge pull request #59 from jdebacker/black_test

GH action to test for proper formatting

.github/workflows/check_formatting.yml

@@ -0,0 +1,15 @@
+
+name: Check Black formatting
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - uses: psf/black@stable
+        with:
+          options: "-l 79 --check"
+          src: "."