Update history to reflect merge of #6618 [ci skip]

977837fa · jekyllbot · 36d70ecb · 977837fa
Commit 977837fa authored 7 years ago by jekyllbot
--- a/History.markdown
+++ b/History.markdown
@@ -30,6 +30,7 @@
  * Updated Jekyll-Pug listing to include official website (#6555)
  * Remove link to severly outdated asset plugin (#6613)
  * Default time zone depends upon server (#6617)
+  * Add `disqus-for-jekyll` to plugins. (#6618)
  
 ### Development Fixes