Try to fix failing build

Relequestual · web-flow · commit 6bfb460102cb · 2018-03-21T10:08:34.000Z
jekyll/jekyll#2938
diff --git a/_config.yml b/_config.yml
@@ -35,6 +35,7 @@ exclude:
 - README.md
 - Gemfile
 - node_modules
+- vendor
 
 plugins:
   - jekyll-relative-links
