Merge pull request #9 from dethos/black-check-ci-job

Black check ci job

.travis.yml

@@ -1,7 +1,22 @@
 # Config file for automatic testing at travis-ci.org
 
+stages:
+  - format
+  - test
+
 language: python
 
+jobs:
+  include:
+    - stage: format
+      name: "Black format check"
+      python: "3.7"
+      install: pip install black
+      script:
+        - black --version
+        - black . --check
+      after_success: ""
+
 python:
   - "3.6"
   - "3.7"
@@ -11,9 +26,6 @@ env:
   - DJANGO_VERSION=django-22
   - DJANGO_VERSION=django-30
 
-matrix:
-  fast_finish: true
-
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install: pip install -r requirements_test.txt