tox.ini: pin black to the pre-commit version (19.10b0) to avoid flip-flops

4d6b9918 · Stefano Zacchiroli · 5e4bb283 · 4d6b9918
Commit 4d6b9918 authored 4 years ago by Stefano Zacchiroli
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ commands =
 [testenv:black]
 skip_install = true
 deps =
-  black
+  black==19.10b0
 commands =
  {envpython} -m black --check swh