Changelog: Add date for 2.0.0.beta1 release

Author: ZimbiX

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 <!-- MarkdownTOC autolink=true -->
 
-- [2.0.0.beta1](#200beta1)
+- [2.0.0.beta1 \(2022-03-24\)](#200beta1-2022-03-24)
 - [1.4.0 \(2022-03-23\)](#140-2022-03-23)
 - [1.3.1 \(2022-02-25\)](#131-2022-02-25)
 - [1.3.0 \(2022-02-25\)](#130-2022-02-25)
@@ -52,7 +52,7 @@
 
 <!-- /MarkdownTOC -->
 
-## 2.0.0.beta1
+## 2.0.0.beta1 (2022-03-24)
 
 **Preliminary release of Ruby 3 support**