Re: README: Add some details of submission mirroring (#4532)

# Firefox #
Testing revision 1a51cc39f2568c61eeb383eb52ab3cb46df7d943
Starting 10 test iterations
No tests run.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4532#issuecomment-272200522

Received on Thursday, 12 January 2017 17:19:20 UTC