remove CLA requirement (#149)

Author: benjchristensen

CONTRIBUTING

@@ -14,13 +14,6 @@ We actively welcome your pull requests.
 4. Ensure the test suite passes.
 5. Make sure your code lints.
 6. Make sure your code is properly formatted by running `devtools/format_all.sh`.
-7. If you haven't already, complete the Contributor License Agreement ("CLA").
-
-## Contributor License Agreement ("CLA")
-In order to accept your pull request, we need you to submit a CLA. You only need
-to do this once to work on any of Facebook's open source projects.
-
-Complete your CLA here: <https://code.facebook.com/cla>
 
 ## Issues
 We use GitHub issues to track public bugs. Please ensure your description is