Update change log

Author: jim-easterbrook

CHANGELOG.txt

@@ -18,6 +18,10 @@ along with this program.  If not, see
 
 Changes in v0.17.0:
   1/ API change: derived classes of BasicIo are omitted from Python.
+  2/ Binary wheels incorporate libexiv2 v0.28.3.
+  3/ enableBMFF() function is deprecated.
+  4/ Documentation is available on https://python-exiv2.readthedocs.io/
+  5/ Improved handling of Windows code page character sets.
 
 Changes in v0.16.3:
   1/ Binary wheels incorporate libexiv2 v0.28.2.