Add 0.2.2 resease notes
Add 0.2.2 resease notes

* mathoid (0.2.2) was published on 19th of Feb but
  the commit was not pushed back to the repo

Change-Id: Ieb97a058ef46db483bf6c916ed1787cd33dbfff4

wikimedia/mathoid,physikerwelt/mediawiki-services-mathoid,kwangkim/mathoid,wikimedia/mathoid,wikimedia/mathoid,MonashAlexandria/mathoid,kwangkim/mathoid,kwangkim/mathoid,wikimedia/mathoid,kwangkim/mathoid,MonashAlexandria/mathoid,physikerwelt/mathoid-server,physikerwelt/mathoid-server,physikerwelt/mathoid-server