test: ignore vendor/ directory on license check

test

@@ -102,7 +102,7 @@ function fmt_tests {
 	fi
 
 	echo "Checking for license header..."
-	licRes=$(for file in $(find . -type f -iname '*.go' ! -path './Godeps/*'); do
+	licRes=$(for file in $(find . -type f -iname '*.go' ! -path './vendor/*'); do
 			head -n3 "${file}" | grep -Eq "(Copyright|generated|GENERATED)" || echo -e "  ${file}"
 		done;)
 	if [ -n "${licRes}" ]; then