Update history to reflect merge of #92 [ci skip]

Author: jekyllbot

History.markdown

@@ -15,6 +15,10 @@
   * Fixes for repository detection on Windows (#136)
   * Make github.com repo URLs always https (#133)
 
+### Documentation
+
+  * Add instructions for using DotEnv (#92)
+
 ## 2.9.4 / 2017-12-08
 
 ### Minor Enhancements