TUN-528: Move cloudflared into a separate repo

vendor/zombiezen.com/go/capnproto2/CONTRIBUTING.md

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+# How to contribute
+
+We'd love to accept your patches and contributions to this project. There are a
+just a few small guidelines you need to follow.
+
+## Code contributions
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult [GitHub Help][] for more
+information on using pull requests.
+
+When you make your first submission to this repository, please add your name to
+the AUTHORS and CONTRIBUTORS file as part of your first pull request.
+
+As a policy, go-capnproto2 should always build cleanly and pass tests on every
+commit.  We run a [Travis build][] that checks before and after merges to
+enforce this policy.  However, as a courtesy to other contributors, please run
+`go test ./...` before sending a pull request (this is what the Travis
+build does).
+
+[GitHub Help]: https://help.github.com/articles/about-pull-requests/
+[Travis build]: https://travis-ci.org/capnproto/go-capnproto2