Merge pull request vbatts#18 from wking/dogfood

.travis.yml: Dogfood git-validation

Author: vbatts

.travis.yml

@@ -23,4 +23,5 @@ script:
   - go vet -x ./...
   - golint ./...
   - go build .
-  - go test -v ./...
+  - go test -v ./...
+  - ./git-validation -run DCO,short-subject,dangling-whitespace -v