pre-commit and black target py35

.pre-commit-config.yaml

@@ -1,12 +1,12 @@
 exclude: "^setup/|/static/lib/|/static/src/lib/"
 default_language_version:
-    python: python3
+    python: python3.5
 repos:
     -   repo: https://github.com/psf/black
         rev: 19.3b0
         hooks:
             -   id: black
-                args: [-l 79]
+                args: [-l 79, --target-version=py35]
     -   repo: https://github.com/pre-commit/pre-commit-hooks
         rev: v2.3.0
         hooks: