Update CHANGES.

CHANGES

@@ -1,5 +1,49 @@
 CHANGES FROM 3.0 to X.X
 
+* Do not use bright when emulating 256 colours on an 8 colour terminal because
+  it is also bold on some terminals.
+
+* Add a "latest" window-size option which tries to size windows based on the
+  most recently used client. This is now the default.
+
+* Make select-pane -P set window-active-style also to match previous behaviour.
+
+* Do not truncate list-keys output.
+
+* Workaround invalid layout strings generated by older tmux versions and add
+  some additional sanity checks
+
+* Turn automatic-rename back on if the \033k rename escape sequence is used
+  with an empty name.
+
+* Add support for percentage sizes for resize-pane ("-x 10%"). Also change
+  split-window and join-pane -l to accept similar percentages and deprecate the
+  -p flag.
+
+* Add -F flag to send-keys to expand formats in search-backward and forward
+  copy mode commands, this makes it easier to use the cursor_word and
+  cursor_line formats.
+
+* Add formats for word and line at cursor position in copy mode.
+
+* Add formats for cursor and selection position in copy mode
+
+* Support all the forms of RGB colour strings in OSC sequences rather than
+  requiring two digits.
+
+* Limit lazy resize to panes in attached sessions only
+
+* Add an option to set the key sent by backspace for those whose system uses ^H
+  rather than ^?
+
+* Change new-session -A without a session name (that is, no -s option also) to
+  attach to the best existing session like attach-session rather than a new
+  one.
+
+* Change window-size default from smallest to latest.
+
+* Add simple support for OSC 7 (result is available in the pane_path format).
+
 * Add push-default and pop-default for styles which change the colours and
   attributes used for #[default]. These are used in status-format to restore
   the behaviour of window-status-style being the default for