message: Use python3 for black to support py>=3.6
diff: @@ -19,7 +19,7 @@ repos:
  rev: stable
  hooks:
  - id: black
  - language_version: python3.6
  + language_version: python3
  - repo: https://github.com/pre-commit/pre-commit-hooks
  rev: v2.2.3
  