Include py39 among black's target versions

haplo · haplo · commit 39307c69a50f · 2021-06-12T16:39:58.000+01:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,5 @@
 [tool.black]
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py36', 'py37', 'py38', 'py39']
 exclude = '''
 /(
 	  \.venv
