Update changelog.txt

Author: b-g

changelog.txt

@@ -14,6 +14,9 @@ New:
   + Chess pieces by @nataliakeniganti #605
 
 Improvements:
+  * Emoji 17.0 changes
+    Moved extras-openmoji/landslide E09D > 1F6D8 by @nataliakeniganti #624
+    Moved extras-openmoji/orca E005 > 1FACD by @nataliakeniganti #624
   * 270D better fingers of drawing hand by Daniel Utz
   * 1F383 removed unnecessary points by @yukal #555
   * font/README.md: easy font usage via jsdelivr.com by @jjb #570