Update README.md

README.md

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-# github-sandbox
-
-> Finally some **permalinks** to test GitHub extensions
-
-When to use this repo:
-
-- When you want to create a test case for Refined GitHub
-
-Rules:
-
-- Do not touch pre-existing files, issues, PRs
-- Once you create, close, delete a file… copy its link and then don't touch it again
-- No specific rules about names, titles, etc… use and write what you need
-
-## Usage example
-
-1. I open an issue named `Testing in-title #1 issue references`
-3. I use its URL in a PR, like:
-  ```md
-	I created this feature that works on titles. 
-
-  # Test URLs
-
-  https://github.com/fregante/github-sandbox/issues/345
-  ```
-3. That's it! The issue you created will be here forever, hence the _permalink_ subtitle.
-
-### Live example
-
-I created several issues and PRs and used it in this demo page: https://github.com/fregante/github-issue-link-status/issues/57
-
-Feel free to reuse the same links when testing, they're guaranteed to never change (they won't be closed, merged, etc)
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