message: Add release notes for 0.9.0
diff: +Changes in 0.9.0 (2018-06-29)
  +=============================
  +**BREAKING CHANGES:**
  + - The bridge now requires a minimum of Node 6.
  +
  +New features & improvements:
  +
  +* **Breaking Change** - Minimum supported version is now Node 6.X #589
  +* Updated winston logger dependency to 2.4.2 #587
  +* Refined colours to match mIRC colours - #483 Thanks @silkeh
  +* Displayname changes now appear as nick changes - #486 Thanks @silkeh
  +* New ``migrate-users`` script to remove suffixes from displaynames - #495 Thanks @SohumB
  +* Rewritten IRC to HTML parsing - #485 Thanks @silkeh
  +* Add m.audio as a valid file type - #504 Thanks @t3chguy
  +* Don't rejoin mapped rooms #594
  +* Announce and leave DM rooms if we don't support it #600
  +
  +
  Changes in 0.8.0 (2017-07-26)
  =============================
  