Make README.md ReST-friendly
Make README.md ReST-friendly

Description at PyPI looks ugly with all these hashes. Changed according
to https://gist.github.com/dupuy/1855764

Change-Id: I070a245d417cf36f115741418764630d053da476

openstack-infra/git-review,meelapshah/git-review,meelapshah/git-review,entropia1/git-review,jeeloo/git-review,ka2m/git-review