In order to accept your pull request, we need you to submit a CLA. You only need to do this once, so if you‘ve done this for another Facebook open source project, you’re good to go. If you are submitting a pull request for the first time, just let us know that you have completed the CLA and we can cross-check with your GitHub username.
Complete your CLA here: https://code.facebook.com/cla
If you prefer to sign a paper copy, we can send you a PDF. Send us an e-mail or create a new github issue to request the CLA in PDF format.