Don't install typing on Python 3.5+
Don't install typing on Python 3.5+

Pypi's typing can cause errors like `AttributeError: type object
'Callable' has no attribute '_abc_registry'`.

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

botify-labs/simpleflow,botify-labs/simpleflow