Merge pull request hound-search#269 from sahildua2305/travis-go-versions

travis: add more recent go versions until 1.9

Author: kellegous

.travis.yml

@@ -4,6 +4,10 @@ go:
   - 1.3
   - 1.4
   - 1.5
+  - 1.6
+  - 1.7
+  - 1.8
+  - 1.9
   - tip
 install: go get ./...
 script: go test ./...