try to fix golint go get

Author: JenniGriesmann

.travis.yml

@@ -47,7 +47,7 @@ install:
   - rm qemu-${QEMU}.tar.${QEMU_EXT} libvirt-${LIBVIRT}.tar.${LIBVIRT_EXT}
 
 before_install:
-  - go get github.com/golang/lint/golint
+  - go get golang.org/x/lint/golint
   - go get golang.org/x/tools/cmd/stringer
 
 before_script: