fix yaml spacing

Author: jazzsequence

README.md

@@ -10,7 +10,7 @@ A GitHub action that validates the last tested plugin version against the curren
 name: Validate Plugin Version
 on:
   schedule:
-	- cron: '0 0 * * 0'
+    - cron: '0 0 * * 0'
 permissions:
   contents: write
   pull-requests: write
@@ -47,4 +47,4 @@ The branch to create the PR against. If not specified, the action will use the `
 
 ## Permissions
 
-The `write` permissions on `contents` and `pull-requests` are important. They are required for the action to commit the changes back to the repository and open a pull request. The only files affected by the action are files named `readme.txt`, `README.md` or those files matching the pattern (looking for "Tested Up To" in the file) that have been specified in the `filenames` input. 
+The `write` permissions on `contents` and `pull-requests` are important. They are required for the action to commit the changes back to the repository and open a pull request. The only files affected by the action are files named `readme.txt`, `README.md` or those files matching the pattern (looking for "Tested Up To" in the file) that have been specified in the `filenames` input.