Update history to reflect merge of #713 [ci skip]

Author: jekyllbot

History.markdown

@@ -64,6 +64,7 @@
   * Fix responsiveness of social SVG sprites (#677)
   * Improve "Subscribe" link in footer (#698)
   * Fix deprecation warnings from Dart Sass (#700)
+  * Fix reference to base layout in `404.html` (#713)
 
 ### Development Fixes