Fill in release date for 3.0.1

CHANGELOG.txt

@@ -1,7 +1,7 @@
 Changelog
 =========
 
-3.0.1 (xx.xx.xxxx) - IN DEVELOPMENT
+3.0.1 (16.06.2022)
 ~~~~~~~~~~~~~~~~~~
 
  * Add warning when `WAGTAILADMIN_BASE_URL` is not configured (Matt Westcott)

docs/releases/3.0.1.md

@@ -1,4 +1,6 @@
-# Wagtail 3.0.1 release notes - IN DEVELOPMENT
+# Wagtail 3.0.1 release notes
+
+_June 16, 2022_
 
 ```{contents}
 ---
@@ -10,6 +12,7 @@ depth: 1
 ## What's new
 
 ### Other features
+
  * Add warning when `WAGTAILADMIN_BASE_URL` is not configured (Matt Westcott)
 
 ### Bug fixes