Fill in release date for 2.6.2

CHANGELOG.txt

@@ -38,7 +38,7 @@ Changelog
  * Fix: Prevent broken images in notification emails when static files are hosted on a remote domain (Eduard Luca)
 
 
-2.6.2 (xx.xx.xxxx)
+2.6.2 (19.09.2019)
 ~~~~~~~~~~~~~~~~~~
 
  * Fix: Prevent search indexing failures on Postgres 9.4 and Django >= 2.2.1 (Matt Westcott)

docs/releases/2.6.2.rst

@@ -1,6 +1,6 @@
-============================================
-Wagtail 2.6.2 release notes - IN DEVELOPMENT
-============================================
+===========================
+Wagtail 2.6.2 release notes
+===========================
 
 .. contents::
     :local: