Updated travis

.travis.yml

@@ -3,18 +3,28 @@ language: go
 go:
   - 1.6
   - 1.7
+  - 1.8
+  - 1.9
   - tip
+
 matrix:
   allow_failures:
     - go: tip
+
+sudo: false
+
 before_install:
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
   - go get golang.org/x/tools/cmd/cover
+
 before_script:
   - gofmt -s -l .
+
 script:
+  - go build
   - go test -coverprofile=coverage.txt -covermode=atomic
+
 after_success:
   - bash <(curl -s https://codecov.io/bash)
   - $HOME/gopath/bin/goveralls -coverprofile=coverage.txt -service=travis-ci