chore(ci): use fixed black version

max-wittig · web-flow · commit 9565684c86cb · 2020-08-29T12:12:53.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -23,7 +23,7 @@ jobs:
       dist: bionic
       python: 3.8
       script:
-        - pip3 install -U --pre black
+        - pip3 install -U --pre black==20.8b1
         - black --check .
     - stage: test
       name: cli_func_v4
