Merge pull request #18 from ddellspe/readme_updates

Update readme formatting

README.md

@@ -1,5 +1,5 @@
 yapf mirror
-=============
+===========
 
 Mirror of yapf package for pre-commit.
 
@@ -11,8 +11,9 @@ For yapf: see https://github.com/google/yapf
 ### Using yapf with pre-commit
 
 Add this to your `.pre-commit-config.yaml`:
-
-    -   repo: https://github.com/pre-commit/mirrors-yapf
-        rev: ''  # Use the sha / tag you want to point at
-        hooks:
-        -   id: yapf
+```yaml
+-   repo: https://github.com/pre-commit/mirrors-yapf
+    rev: ''  # Use the sha / tag you want to point at
+    hooks:
+    -   id: yapf
+```