Fill in release date for 2.10.2

CHANGELOG.txt

@@ -22,7 +22,7 @@ Changelog
  * Fix: Properly distinguish child blocks when comparing revisions with nested StreamBlocks (Martin Mena)
 
 
-2.10.2 (xx.xx.xxxx) - IN DEVELOPMENT
+2.10.2 (25.09.2020)
 ~~~~~~~~~~~~~~~~~~~
 
  * Fix: Avoid use of `icon` class name on userbar icon to prevent clashes with front-end styles (Karran Besen)

docs/releases/2.10.2.rst

@@ -1,6 +1,6 @@
-=============================================
-Wagtail 2.10.2 release notes - IN DEVELOPMENT
-=============================================
+============================
+Wagtail 2.10.2 release notes
+============================
 
 .. contents::
     :local: