Update Changes

Author: lestrrat

Changes

@@ -4,7 +4,7 @@ Changes
 v2 has many incompatibilities with v1. To see the full list of differences between
 v1 and v2, please read the Changes-v2.md file (https://github.com/lestrrat-go/jwx/blob/develop/v2/Changes-v2.md)
 
-v2.0.20 UNRELEASED
+v2.0.20 20 Feb 2024
 [New Features]
   * [jwe] Added `jwe.Settings(WithMaxBufferSize(int64))` to set the maximum size of
     internal buffers. The default value is 256MB. Most users do not need to change