Update .travis to use v1.5 for go
diff --git a/.travis.yml b/.travis.yml
index 0882a56..bd9e4c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,10 +2,10 @@
 install:
   - go get -v -tags 'fixtures acceptance' ./...
 go:
-  - 1.1
   - 1.2
   - 1.3
   - 1.4
+  - 1.5
   - tip
 script: script/cibuild
 after_success: