Minor post-merge cleanup wrt #500, add release note entry

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -241,6 +241,10 @@ James Agnew (jamesagnew@github)
   * Contributed implementation of #611: Optionally allow leading decimal in float tokens
   (2.11.0)
 
+Pavan Kalyan (pavan-kalyan@github)
+  * Contributed #500: Allow "optional-padding" for `Base64Variant`
+  (2.12.0)
+
 Jendrik Johannes (jjohannes@github)
   * Contributed #618: Publish Gradle Module Metadata
   (2.12.0)

release-notes/VERSION-2.x

@@ -16,6 +16,8 @@ JSON library.
 
 2.12.0 (not yet released)
 
+#500: Allow "optional-padding" for `Base64Variant`
+ (contributed by Pavan K)
 #618: Publish Gradle Module Metadata
  (contributed by Jendrik J)
 #619: Add `StreamReadCapability` for further format-based/format-agnostic