Update changelog

Issue #682 was implicitly fixed by
77a8f103d8.

Closes #682.

README.md

@@ -190,6 +190,8 @@ information on what to include when reporting a bug.
                   incorrect position and size (#748)
 - [Cocoa] Bugfix: Iconified full screen windows could not be restored (#848)
 - [Cocoa] Bugfix: Value range was ignored for joystick hats and buttons (#888)
+- [Cocoa] Bugfix: Full screen framebuffer was incorrectly sized for some video
+                  modes (#682)
 - [X11] Moved to XI2 `XI_RawMotion` for disable cursor mode motion input (#125)
 - [EGL] Added support for `EGL_KHR_get_all_proc_addresses` (#871)
 - [EGL] Added support for `EGL_KHR_context_flush_control`