Update change log

Author: jim-easterbrook

CHANGELOG.txt

@@ -15,6 +15,9 @@ 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 1.8.5:
+  1/ Fix memory leak in gp_camera_get_config.
+
 Changes in 1.8.4:
   1/ Fix segfault if camera disconnected before calling get_storageinfo.