use the code-block feature
subtree merge blosc v1.3.3
syntax fixes
Getting ready to release 1.2.1-rc2
add the version badge
reverse the order of the PyPi versiona and download badges
Merge pull request #61 from Blosc/feature/readme_improvements

Feature/readme improvements
Actually will skip 1.2.1-rc1 and will go straight to 1.2.1 final.
Added a wider range of Python versions that are supported.
Post 1.2.1 release actions done.