Set release date in changelog for version 1.2.1

Since it didn't happen during release.

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

Author: weierophinney

CHANGELOG.md

@@ -24,7 +24,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 1.2.1 - TBD
+## 1.2.1 - 2020-08-12
 
 ### Added