Fill in release date for 2.5

CHANGELOG.txt

@@ -11,7 +11,7 @@ Changelog
  * Fix: The Wagtail version number is now visible within the Settings menu (Kevin Howbrook)
 
 
-2.5 (xx.xx.xxxx) - IN DEVELOPMENT
+2.5 (24.04.2019)
 ~~~~~~~~~~~~~~~~
 
  * Django 2.2 support (Matt Westcott, Andy Babic)

docs/releases/2.5.rst

@@ -1,6 +1,6 @@
-==========================================
-Wagtail 2.5 release notes - IN DEVELOPMENT
-==========================================
+=========================
+Wagtail 2.5 release notes
+=========================
 
 .. contents::
     :local: