Update Black dev dependency

bgrant · bgrant · commit 2f2f65602e46 · 2021-06-21T17:06:23.000-05:00
There is a bug in 19.3b0 which may cause problems locally. psf/black#875
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -1,5 +1,5 @@
 bandit~=1.7
-black==19.3b0
+black==21.5b1
 bumpversion~=0.5
 coverage~=5.0
 flake8~=3.9.0
