[GHC] #9665: Add "since" information to LANGUAGE extensions in GHC user guide

[GHC]

#9665: Add "since" information to LANGUAGE extensions in GHC user guide
-------------------------------------+-------------------------------------
        Reporter:  andreas.abel      |                   Owner:  rasen
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Documentation     |                 Version:  7.9
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D1019
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"8b55788cae54c9b79b9fc973e9e77f0de1ccc49b/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8b55788cae54c9b79b9fc973e9e77f0de1ccc49b"
 Add "since" column for LANGUAGE extensions in user guide

 Reviewers: austin

 Reviewed By: austin

 Subscribers: thomie, bgamari

 Differential Revision: https://phabricator.haskell.org/D1019

 GHC Trac Issues: #9665
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9665#comment:10>
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