Ignore vendor scripts in eslint.

Author: Yeray Diaz Diaz

Makefile

@@ -91,7 +91,7 @@ lint: .state/env/pyvenv.cfg
 	#       so we can remove extra_whitespace from below.
 	$(BINDIR)/html_lint.py --printfilename --disable=optional_tag,names,protocol,extra_whitespace `find ./warehouse/templates -path ./warehouse/templates/legacy -prune -o -name '*.html' -print`
 
-	./node_modules/.bin/eslint 'warehouse/static/js/**'
+	./node_modules/.bin/eslint 'warehouse/static/js/**' --ignore-pattern 'warehouse/static/js/vendor/**'
 	./node_modules/.bin/sass-lint --verbose
 
 docs: .state/env/pyvenv.cfg