update changelog

Author: puredanger

CHANGELOG.md

@@ -2,7 +2,8 @@ Changelog
 ===========
 
 * next
-  * Removed allocation of unused ArrayList
+  * Fix unused ArrayList allocation
+  * Fix DIMAP-7 - Minor typos in README and docstring
 * 1.0.0 on Aug 19, 2020
   * Fix DIMAP-15 - PersistentIntMap equals/equiv gives wrong result
   * Fix DIMAP-14 - Support element lookup on transient sets