Update install instructions to point at the release

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
Specify license more precisely to make PYPI happy

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
Bump version to 0.1.3

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>