Issue 11 adds capability for multiple documents in yaml

Currently Yaml using multiple documents will not be allowed and would
fail the pre-commit. Using the additional arguments it allows these
types of files

Author: Olivia Wilson

.pre-commit-config.yaml

@@ -5,6 +5,7 @@ repos:
     rev: cef0300fd0fc4d2a87a85fa2093c6b283ea36f4b # v5.0.0
     hooks:
       - id: check-yaml
+        args: ["--allow-multiple-documents"]
       - id: forbid-submodules
       - id: check-added-large-files
       - id: check-case-conflict