add missing plugins

Michael Haberler · Michael Haberler · commit 081ee384b190 · 2016-05-30T17:46:11.000Z
diff --git a/_config.yml b/_config.yml
@@ -12,6 +12,9 @@ gems:
   - jekyll-asciinema
   - jekyll-youtube
   - jekyll-toc
+  - jekyll-gist
+  - jekyll-seo-tag
+  - jekyll-mermaid
 
 #url: http://machinekit.io
 baseurl: /
