sudo is not needed by travis anymore

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index c56daed..f08128c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 language: go
 script: "./test.sh"
-sudo: false
 go:
     - 1.3.3
     - 1.4.2