Added proselint pre-commit check.

.pre-commit-config.yaml

@@ -55,3 +55,9 @@ repos:
     rev: 1.6.1
     hooks:
       - id: bandit
+  - repo: https://github.com/amperser/proselint/
+    rev: 0.10.2
+    hooks:
+      - id: proselint
+        types: [plain-text]
+        exclude: LICENSE|requirements