bug w/ ChangeStats
bumps ::ChangeStats::Git
to allow for bootstrapping
v0.18.0

 [BUG FIXES]
 - Push version dependencies out of the main module to allow  for
   bootstrapping.

 [ENHANCEMENTS]
 - Bump D::Z::P::ChangeStats::Git to v0.2.1.

 [STATISTICS]
 - code churn: 3 files changed, 16 insertions(+), 6 deletions(-)