[dlang.org] [D-Programming-Language/dlang.org] f811f3: Trivial: replace git co with git checkout

[GitHub via dlang.org]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/dlang.org
  Commit: f811f3d3e57f0521097ba8027078506ff8a7935e
      https://github.com/D-Programming-Language/dlang.org/commit/f811f3d3e57f0521097ba8027078506ff8a7935e
  Author: Andrei Alexandrescu <andrei at erdani.com>
  Date:   2015-01-25 (Sun, 25 Jan 2015)

  Changed paths:
    M posix.mak

  Log Message:
  -----------
  Trivial: replace git co with git checkout