DOC: Update changelog with release date

effigies · effigies · commit 15df13870930 · 2018-06-12T14:12:54.000-04:00
diff --git a/Changelog b/Changelog
@@ -24,8 +24,8 @@ Gerhard (SG) and Eric Larson (EL).
 
 References like "pr/298" refer to github pull request numbers.
 
-Upcoming Release
-================
+2.3 (Tuesday 12 June 2018)
+==========================
 
 New features
 ------------
