Pin black to the version last used to lint master

ddelange · ddelange · commit 19f536401159 · 2020-10-07T23:01:20.000+02:00
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: stable
+    rev: 19.10b0
     hooks:
       - id: black
 
