Better gofmt check, now without an error.

.travis.yml

@@ -8,7 +8,7 @@ install:
     - go get -v .
     - go get -v github.com/golang/lint/golint
 script:
-    - diff <(gofmt -d .) <("")
+    - diff <(gofmt -d .) <(echo -n)
     - go vet -x ./...
     - golint -set_exit_status ./...
     - go test -v -race ./...