Update action.yml

Author: derberg

action.yml

@@ -15,6 +15,7 @@ inputs:
     default: 'asyncapi.yml'
   template:
     description: 'Template for the generator. Official templates are listed here https://github.com/search?q=topic%3Aasyncapi+topic%3Agenerator+topic%3Atemplate. You can pass template as npm package, url to git repository, link to tar file or local template.'
+    default: '@asyncapi/markdown-template@2.0.0'
     required: false
   language:
     description: 'Language of the generated code. This input is required if you want to generate models. List of available languages can be found in https://www.asyncapi.com/docs/tools/cli/usage#asyncapi-generate-models-language-file'