Update .travis.yml
diff --git a/.travis.yml b/.travis.yml
index 9cf8bb7..183f1b7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,10 @@
   - go test -race -v ./...
 
 go:
-  - 1.4
   - 1.5
   - 1.6
+  - 1.7
+  - 1.8
   - tip
 
 matrix: