updating the import path for golint

Author: Eric Rutherford

.travis.yml

@@ -7,7 +7,7 @@ go:
   - 1.10.x
 
 before_install:
-  - go get github.com/golang/lint/golint
+  - go get golang.org/x/lint/golint
 
 before_script:
   - go vet ./...