docs: specify GitHub token scope

docs/local-development.md

@@ -37,7 +37,7 @@ e.g. if your GitHub username is "alex88" then maybe you register "alex88-testing
 
 #### Generate platform token
 
-Once you have decided on your platform and account, log in and [generate a "Personal Access Token"](https://help.github.com/articles/creating-a-personal-access-token-for-the-command-line/) that can be used to authenticate Renovate.
+Once you have decided on your platform and account, log in and [generate a "Personal Access Token"](https://help.github.com/articles/creating-a-personal-access-token-for-the-command-line/) that can be used to authenticate Renovate. Select **repo** scope when generating the token.
 
 #### Export platform token