Bump Rust version in Travis (to 1.2).

BurntSushi · BurntSushi · commit cedb3ae5a4b5 · 2016-01-30T23:09:37.000-05:00
Always test on Rust stable.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 language: rust
 rust:
-  - 1.0.0
+  - 1.2.0
+  - stable
   - beta
   - nightly
 sudo: false

-Original file line number
+Diff line change
@@ @@ -1,6 +1,7 @@ @@
 language: rust
 rust:
 -  - 1.0.0
 +  - 1.2.0
 +  - stable
   - beta
   - nightly
 sudo: false