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	Include common example for fetching PR base-ref
Since this seems to be a common scenario and is generating a lot of discussion (#93), it seems worthwhile to add it to the readme as an example. I placed it before the other fetch examples because this use-case still only fetches minimal history (only adding one additional ref); so it seems helpful to place this above the other fetch examples which all do deeper fetches.
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					@ -112,15 +112,18 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
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- [Checkout a different branch](#Checkout-a-different-branch)
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					- [Checkout a different branch](#Checkout-a-different-branch)
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- [Checkout HEAD^](#Checkout-HEAD)
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					- [Checkout HEAD^](#Checkout-HEAD)
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- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
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					- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
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- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
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					- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
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- [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
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					- [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
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- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
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					- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
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- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
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					- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
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					- [Fetch pull request base-ref in addition to merge commit (for diffing)](#Fetch-pull-request-base-ref-in-addition-to-merge-commit-for-diffing)
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- [Fetch all tags](#Fetch-all-tags)
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					- [Fetch all tags](#Fetch-all-tags)
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- [Fetch all branches](#Fetch-all-branches)
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					- [Fetch all branches](#Fetch-all-branches)
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- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
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					- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
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## Checkout a different branch
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					## Checkout a different branch
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```yaml
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					```yaml
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      - uses: actions/checkout@v2
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					      - uses: actions/checkout@v2
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```
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					```
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					## Fetch pull request base-ref in addition to merge commit (for diffing)
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					```yml
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					- uses: actions/checkout@v2
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					- name: Fetch base_ref HEAD
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					  run: git fetch --depth=1 origin +refs/heads/${{github.base_ref}}:refs/remotes/origin/${{github.base_ref}}
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					- run: git diff origin/${{github.base_ref}}..HEAD
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					```
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## Fetch all tags
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					## Fetch all tags
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```yaml
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					```yaml
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