Merge pull request #601 from Carreau/darker

Ensure new code respect black

.github/workflows/python-package.yml

@@ -0,0 +1,28 @@
+name: New code is black complient.
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install 'darker>=1.1'
+    - name: Lint with black
+      run: |
+        darker --check -r 61c7c8f5030d116de210f67d851ec9afa9f16170 .