Update CHANGELOG.md for 9.1.6

[ci skip]

CHANGELOG.md

@@ -223,6 +223,10 @@ entry.
 - Fix preemptive scroll bar on user activity calendar.
 - Pipeline chat notifications convert seconds to minutes and hours.
 
+## 9.1.6 (2017-06-02)
+
+- Fix visibility when referencing snippets.
+
 ## 9.1.5 (2017-05-31)
 
 - Move uploads from 'public/uploads' to 'public/uploads/system'.