update changelog

Bernhard Posselt · Bernhard Posselt · commit b402901af9fb · 2018-01-02T13:37:33.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased] 
 
+## [3.1.1] - 2018-01-02
+
 ### Changed
 
 - Get rid of moment.js and add functionality on the server in order to reduce file size
