Add isort check

Author: blazewicz

.github/workflows/pythonpackage.yml

@@ -30,6 +30,9 @@ jobs:
     - name: Check style
       run: |
         flake8 src --count --statistics
+    - name: Check import order
+      run: |
+        isort src --check-only --recursive
     - name: Check typing
       run: |
         mypy src

setup.cfg

@@ -1,5 +1,11 @@
 [flake8]
 max-line-length = 120
 
+[isort]
+# https://github.com/timothycrosley/isort/wiki/isort-Settings
+line_length = 120
+multi_line_output = 3
+include_trailing_comma = True
+
 [mypy]
 disallow_untyped_defs = true