cms-git-tools: bump version to v0.9.0

v0.9.0 - eb963067413118278c58bdd3190d7c2b18399fd6

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Merge pull request #126 from davidlt/new-cms-git-tools

[CMSSW_7_0_X] cms-git-tools v0.9.0