Update changelog for release 2.1.0.

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.1.0 - Currently in Development
+## 2.1.0 - 2021-01-08
 
 ### Added
 
@@ -12,10 +12,14 @@ redirect status.
 - Email is now more configurable than before (SMTP support, etc.).
 - "Recently added" screens have been added for items, people, and series.
 - Users with edit privileges can now toggle to edit mode using convenient links.
+- User menus in the front end are now duplicated at the top and bottom of the display for convenience.
 
 ### Changed
 
+- Clicking on a publisher name in the publisher tab of the series editor now links to the
+publisher instead of popping up the advanced options dialog.
 - Email is now sent using the laminas-mail library.
+- If an item has both numbered and unnumbered entries in the same series, the unnumbered versions will not be displayed in the series summary list.
 
 ### Removed
 
@@ -24,6 +28,7 @@ redirect status.
 ### Fixed
 
 - The "items with reviews" display has been improved to fix some bugs.
+- Links to parent items in the "known editions" list now link to the correct place.
 
 ## 2.0.0 - 2020-11-04