Add README.mkdn for GitHub

  Requires Author::JQUELIN bundle 3.002
Fix Git::NextVersion to work with Git 1.8

  A change in git rev-list output broke version_by_branch=1
  Fixes RT#86251
v2.014

 - fix rt#86251 - version-by-branch.t fails with Git 1.8.3
   The output of "git rev-list" changed slightly, and this broke
   Git::NextVersion when using version_by_branch=1.
   (christopher madsen, reported by zak elep)