Add docformatter. (#18)

Author: tobiasraabe

.pre-commit-config.yaml

@@ -64,6 +64,11 @@ repos:
     rev: v1.20.1
     hooks:
     -   id: setup-cfg-fmt
+-   repo: https://github.com/myint/docformatter
+    rev: v1.3.1
+    hooks:
+    -   id: docformatter
+        args: [--in-place, --wrap-summaries, "88", --wrap-descriptions, "88", --blank]
 -   repo: https://github.com/econchick/interrogate
     rev: 1.5.0
     hooks: