Updated change log

Author: jim-easterbrook

CHANGELOG.txt

@@ -1,6 +1,6 @@
 python-gphoto2 - Python interface to libgphoto2
 http://github.com/jim-easterbrook/python-gphoto2
-Copyright (C) 2014-19  Jim Easterbrook  jim@jim-easterbrook.me.uk
+Copyright (C) 2014-20  Jim Easterbrook  jim@jim-easterbrook.me.uk
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -15,6 +15,13 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+Changes in 2.1.0:
+  1/ COMPATIBILITY CHANGE: gp_file_set_data_and_size and gp_file_append now
+     take a single buffer parameter (such as a bytes string) instead of a
+     string and length.
+  2/ Fixed memory double free bug in gp_file_set_data_and_size.
+  3/ Removed support for libgphoto2 v2.4.
+
 Changes in 2.0.0:
   1/ COMPATIBILITY CHANGE: gp_log_add_func and use_python_logging now return a
      Python object which must be stored until logging is no longer needed.