Auto merge of #19410 - servo:SimonSapin-patch-1, r=nox

Firefox is now on Rust 1.21

https://bugzilla.mozilla.org/show_bug.cgi?id=1409533

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bors-servo 2017-11-28 07:33:38 -06:00 committed by GitHub
commit 2eb266b314

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@ -1 +1 @@
1.20.0 1.21.0