changelog: both changes go into 3.2.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ljnxm1Qjrocq1izGajLx8J

Author: matmen

CHANGELOG.md

@@ -16,6 +16,8 @@
 
 ### Fixes
 
+- TGA encoding: run length encoded packets end with the row, as TGA 2.0 requires. Before, packets could span rows,
+  which some readers reject (Pillow fails with "buffer overrun").
 - PNG text metadata: text that isn't Latin-1 (like `©` is, but `Ⓒ` or emoji aren't) is written into `iTXt` chunks as
   UTF-8 instead of `tEXt`, where readers showed it garbled; text chunks come before the image data, where all readers
   look for them.