Update CHANGELOG

[ci skip]

CHANGELOG

@@ -3,7 +3,6 @@ Please view this file on the master branch, on stable branches it's out of date.
 v 8.3.0 (unreleased)
 
 v 8.2.0
-v 8.2.0 (unreleased)
   - Fix grouping of contributors by email in graph.
   - Remove CSS property preventing hard tabs from rendering in Chromium 45 (Stan Hu)
   - Fix Drone CI service template not saving properly (Stan Hu)
@@ -1957,4 +1956,4 @@ v 0.8.0
   - stability
   - security fixes
   - increased test coverage
-  - email notification
\ No newline at end of file
+  - email notification