Try pinning to a Twisted version that worked
Try pinning to a Twisted version that worked

So Twisted 17.1.0 came out right when
https://travis-ci.org/servo/saltfs/jobs/201390958 failure started happening,
as Aneesh noted in https://github.com/servo/saltfs/issues/601

UK992/saltfs,ALikhachev/saltfs,ALikhachev/saltfs,ALikhachev/saltfs,rwaweber/saltfs,rwaweber/saltfs,UK992/saltfs,rwaweber/saltfs,servo/saltfs,servo/saltfs,UK992/saltfs