Prevent lint on vendor directory in subdirectories

Change-Id: I359eb4ceac63138051509b395bc3f7a5e46e9926
diff --git a/Makefile b/Makefile
index f2923fd..1ae2ffd 100644
--- a/Makefile
+++ b/Makefile
@@ -46,7 +46,7 @@
 	@echo "---"
 	@cat $(LINT_STYLE)
 	@echo "---"
-	mdl -s $(LINT_STYLE) `find -L . ! -path "./partials/*" ! -path "./_book/*" ! -path "./repos/*"  ! -path "./node_modules/*" ! -path "./cord-tester/modules/*" ! -path "./vendor/*" -name "*.md"`
+	mdl -s $(LINT_STYLE) `find -L . ! -path "./partials/*" ! -path "./_book/*" ! -path "./repos/*"  ! -path "./node_modules/*" ! -path "./cord-tester/modules/*" ! -path "*/vendor/*" -name "*.md"`
 
 linkcheck: $(ALL_DOCS) _book
 	linkchecker -a -f linkchecker.ini _book/