update release notes

ReleaseNotes.txt

@@ -4,6 +4,7 @@ News:
 #1823: New transcription implementation using Whisper (@lfcnassif, @gfd2020, @marcus6n) 
 #2118: New table column header filter like Excel (@patrickdalla, @lfcnassif, @wladimirleite)
 #1182: Translation to French (Didier Meziat-Burdin, Christopher Etienne, @jelallt, @lfcnassif)
+#1896: Parser for Threema Secure Messenger files (@costa-arc, @lfcnassif)
 #1969: Utility tool to scan a folder for cases and export files matching a search criteria (@lfcnassif)
 #2028: Better support for UFDR generated by Physical Analyzer version 8+ (@marcosammoura)
 #2262: Compatibility with PA 10: Attachment being considered file (@aberenguel)