[phobos] [D-Programming-Language/phobos] ec31c0: Update changelog for issue 7480

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: ec31c04665731b99f1663ff9fbd94c52b5184395
      https://github.com/D-Programming-Language/phobos/commit/ec31c04665731b99f1663ff9fbd94c52b5184395
  Author: k-hara <k.hara.pg at gmail.com>
  Date:   2012-02-11 (Sat, 11 Feb 2012)

  Changed paths:
    M changelog.dd

  Log Message:
  -----------
  Update changelog for issue 7480