Upgrade black to 19.3b0 (#987)

ekampf · web-flow · commit 6e2bb3bc3011 · 2019-06-01T19:05:38.000-07:00
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -18,7 +18,7 @@ repos:
     hooks:
     -   id: pyupgrade
 -   repo: https://github.com/ambv/black
-    rev: 18.9b0
+    rev: 19.3b0
     hooks:
     - id: black
       language_version: python3
