We'd love to accept your patches and contributions to this project. There are just a few small guidelines you need to follow.
Please make any changes in a separate fork and make a PR to the release
branch when your changes are ready. Tags for new release versions will be cut
from the release branch.
Contributions to this project must be accompanied by a Contributor License Agreement. You (or your employer) retain the copyright to your contribution, this simply gives us permission to use and redistribute your contributions as part of the project. Head over to https://cla.developers.google.com/ to see your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.