update readme

Author: bryanmacfarlane

README.md

@@ -29,11 +29,11 @@ $ npm test
 ...
 ```
 
-## Change actions.yml
+## Change action.yml
 
-The actions.yml contains defines the inputs and output for your action.
+The action.yml contains defines the inputs and output for your action.
 
-Update the actions.yml with your name, description, inputs and outputs for your action.
+Update the action.yml with your name, description, inputs and outputs for your action.
 
 See the [documentation](https://help.github.com/en/articles/metadata-syntax-for-github-actions)