Fix a typo

Author: lambda-fairy

_posts/2014-09-15-Rust-1.0.md

@@ -130,7 +130,7 @@ adopt the "channel" system used by many other projects such as
 [Chrome](http://www.chromium.org/getting-involved/dev-channel), and
 [Ember.js](http://emberjs.com/builds/).
 
-The idea is that there are three channels: Nighly, Beta, and
+The idea is that there are three channels: Nightly, Beta, and
 Stable. The Nightly channel is what you use if you want the latest
 and greatest: it includes unstable features and libraries that may
 still change in backwards incompatible ways. Every six weeks, we cut a