Update history to reflect merge of #1984

History.markdown

@@ -60,6 +60,7 @@
   * Update the README to reflect the repo move (#1943)
   * Add the project vision to the README (#1935)
   * Speed up Travis CI builds by using Rebund (#1985)
+  * Use Yarp as a Gem proxy for Travis CI (#1984)
 
 ### Site Enhancements
   * Document Kramdown's GFM parser option (#1791)