[commit: packages/base] ghc-7.8's head updated: Update `changelog.md` to contain more changes (09baac2)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/base

Branch 'ghc-7.8' now includes:

     428304c Add newline before two `/Since: 4.7.0.0/` occurences
     63f669b Add Hackage-supported `changelog.md` file
     f6a3a9a Add `/Since: 4.7.0.0/` to `MkFixed` constructor
     09baac2 Update `changelog.md` to contain more changes