Use new container based Travis instance

methane · methane · commit 1fde9311d320 · 2015-02-12T17:25:28.000+09:00
It's faster.
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,4 @@
+sudo: false
 language: go
 go:
   - 1.1
