- Added more pre-commit checks.

.pre-commit-config.yaml

 ---
+-   repo: git://github.com/pre-commit/pre-commit-hooks
+    sha: cf550fcab3f12015f8676b8278b30e1a5bc10e70
+    hooks:
+    -   id: check-added-large-files
+    -   id: check-yaml
+    -   id: check-merge-conflict
 - repo: local
   hooks:
   - id: shell-lint