fix travis validate license problem

.travis.yml

@@ -17,7 +17,7 @@ script:
   - chmod u+x before_ut.sh && ./before_ut.sh
   - chmod u+x before_validate_license.sh && ./before_validate_license.sh
   - chmod u+x tools/license/license-header-checker && [[ -z `git status -s` ]]
-  - tools/license/license-header-checker -a -r -i vendor  tools/license/license.txt . go
+  - tools/license/license-header-checker -v -a -r -i vendor  tools/license/license.txt . go
   - go mod vendor && go test ./... -coverprofile=coverage.txt -covermode=atomic
 
 after_success: