Update history to reflect merge of #775 [ci skip]

Author: jekyllbot

History.markdown

@@ -71,6 +71,7 @@
   * Improve "Subscribe" link in footer (#698)
   * Fix deprecation warnings from Dart Sass (#700)
   * Fix reference to base layout in `404.html` (#713)
+  * Minimal fixes for Disqus (#775)
 
 ### Development Fixes