update CHANGES to show versioning better

CHANGES

@@ -5,20 +5,20 @@ Changelog
 Here you can find the recent changes to tmuxp
 
 - :release:`1.2.5 <2017-02-08>`
-- :feature:`207` add custom tmuxp config directory via ``TMUXP_CONFIGDIR``
-  variable.
-- :support:`199` support for running tmuxp on tmux ``master``.
-- :support:`-` update libtmux from 0.6.2 to 0.6.3.
+- :feature:`207 backported` add custom tmuxp config directory via
+  ``TMUXP_CONFIGDIR`` variable.
+- :support:`199 backported` support for running tmuxp on tmux ``master``.
+- :support:`- backported` update libtmux from 0.6.2 to 0.6.3.
 
 - :release:`1.2.4 <2017-01-13>`
-- :bug:`198` bump click from 6.6 to 6.7
-- :support:`195` pin packages for colorama and doc requirements
+- :bug:`198 backported` bump click from 6.6 to 6.7
+- :support:`195 backported` pin packages for colorama and doc requirements
 
 - :release:`1.2.3 <2016-12-21>`
-- :support:`-` bump libtmux 0.6.0 to 0.6.1
-- :support:`193` improve suppress history test, courtesy of @abeyer.
-- :support:`191` documentation typo from @modille
-- :support:`186` documentation typo from @joelwallis
+- :support:`- backported` bump libtmux 0.6.0 to 0.6.1
+- :support:`193 backported` improve suppress history test, courtesy of @abeyer.
+- :support:`191 backported` documentation typo from @modille
+- :support:`186 backported` documentation typo from @joelwallis
 
 - :release:`1.2.2 <2016-09-16>`
 - :bug:`181` Support tmux 2.3