Use golint

.travis.yml

@@ -13,11 +13,13 @@ addons:
 
 install:
   - go get golang.org/x/tools/cmd/cover
+  - go get github.com/golang/lint/golint
   - go get github.com/mattn/goveralls
 
 script:
   # a workaround for go test not supporting coverage for multiple packages in a single invocation.
   # If goveralls upload fails, ignore the result.
+  - $HOME/gopath/bin/golint ./...
   - |-
     echo 'mode: count' > coverage.merged && go list ./... | xargs -n1 -I{} sh -c ': > coverage.tmp; go test -v -covermode=count -coverprofile=coverage.tmp {} && tail -n +2 coverage.tmp >> coverage.merged' && rm coverage.tmp
   - |-