Auto merge of #20 - servo:jdm-patch-1, r=frewsxcv

Update rust nightly to keep in sync with Servo.

Rustup happened in servo/servo#10076

Author: bors-servo

.travis.yml

@@ -1,7 +1,7 @@
 language: rust
 rust:
   - nightly
-  - nightly-2016-03-07 # Should be kept in sync with Servo.
+  - nightly-2016-03-18 # Should be kept in sync with Servo.
 matrix:
   allow_failures:
     - rust: nightly