Update README.md

Add brief explanation on current limitation of labeling PRs from forks.
jimschubert · Apr 19, 2020 · c58555a · c58555a
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 GitHub Action allowing for applying labels to issues and pull requests based on patterns found in the title or description.
 
+> NOTE: Due to limitations on GitHub Actions for [events that trigger workflows](https://help.github.com/en/actions/reference/events-that-trigger-workflows), labels from pull requests coming from forks are not currently supported.
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 ## Usage
 
 ### Define `.github/labeler.yml`