Merge pull request #2 from rstorey/yaml-prettier

This is reasonable: I'd left that out by default since some projects have things Ansible playbooks with settings other than Prettier's defaults but we already assume that those projects can adjust their configuration as needed.

.pre-commit-config.yaml

@@ -37,7 +37,7 @@ repos:
       rev: 1.18.2
       hooks:
           - id: prettier
-            files: \.(css|less|scss|ts|tsx|graphql|gql|js|jsx|md)$
+            files: \.(css|less|scss|ts|tsx|graphql|gql|js|jsx|md|yml|yaml)$
     - repo: https://github.com/pre-commit/mirrors-eslint
       rev: v6.4.0
       hooks: