Add yaml hook.

.pre-commit-config.yaml

@@ -1,20 +1,23 @@
 -   repo: git@github.com:pre-commit/pre-commit-hooks
-    sha: bec87f6c87284ea15dbcf7801810404c8036bab4
+    sha: 84fbf05803f25fea2ad4a9509b3666840bf580b4
     hooks:
-    -   id: pyflakes
-        files: \.py$
-    -   id: debug-statements
-        files: \.py$
     -   id: trailing-whitespace
         files: \.(py|sh|yaml)$
-    -   id: name-tests-test
-        files: tests/.+\.py$
     -   id: end-of-file-fixer
         files: \.(py|sh|yaml)$
+    -   id: check-yaml
+        files: \.(yaml|yml)$
+    -   id: debug-statements
+        files: \.py$
+    -   id: name-tests-test
+        files: tests/.+\.py$
+    -   id: pyflakes
+        files: \.py$
 -   repo: git@github.com:pre-commit/pre-commit
-    sha: c62c1a3b513ab9e057e85a5e950bd7c438371076
+    sha: 3cfc49b522dee27cdcce83781cd874c5638ad6c1
     hooks:
-    -   id: validate_manifest
-        files: ^hooks.yaml$
     -   id: validate_config
         files: ^\.pre-commit-config.yaml$
+    -   id: validate_manifest
+        files: ^hooks.yaml$
+        exclude: ^$