Fix License in setup.py
Fix License in setup.py

See https://github.com/pypa/twine/issues/454#issuecomment-464077386: the
"license" field should be a single statement (content other than the
description with double newlines breaks the metadata).

Signed-off-by: Yves Bastide <3b1fe340dba76bf37270abad774f327f50b5e1d8@botify.com>

botify-labs/simpleflow,botify-labs/simpleflow