CHANGELOG.md in ob64-0.3.0 vs CHANGELOG.md in ob64-0.4.0

@@ -1,6 +1,10 @@
 ## [Unreleased]
 
+# [0.4.0] - 2021-09-28
+
+- Detail gemspec. Ignore.
+
 ## [0.3.0] - 2021-09-28
 
 - Raise error when attempting to get the base64-decoded length of an invalid (in
   length) base64-encoded payload.