update changelog

Author: methane

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 Release Date: TBD
 
-- Support free threaded Python. #654
+- Support free threaded Python. #654, #686
 - Dropped support for Python 3.9. #656
 - Fix missing error checks in C code. #665, #666, #667, #672
 - Fix `strict_map_key` option didn't work for `object_pairs_hook`. #673
@@ -11,6 +11,7 @@ Release Date: TBD
 - Fix `Packer.pack_ext_type()` ignored `autoreset` option. #663
 - Fix `Timestamp.from_datetime()` returning wrong value for pre-epoch datetimes. #662
 - Fix use-after-free in `unpackb()` and `Unpacker.unpack()` for non-contiguous input. #677
+- Fix possible memory leak when calling `Unpacker.__init__()` several times. #687
 
 
 # 1.1.2