Adding a pull request to an existing upstream issue is easy assuming you forked using the normal github means.
Simply reference the issue in your commit message using any of the supported keywords:
- close
- closes
- closed
- fix
- fixes
- fixed
- resolve
- resolves
- resolved
For example: "this commit fixes #116"
The text referencing the issue does not need to appear in the subject line of your commit.
Push your commit to your github repo and the pull request will be automatically appended to the issue.
Note: While it is not required, it is strongly recommended that you commit anything that will be part of a pull request to a separate branch specific to that issue, because future commits on that branch will be appended to the pull request (automatically by github). So, if you didn't make a separate branch, left it on master, and then kept developing, then all your unrelated commits to master would get appended to your pull request.
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