Describe the bug
I am trying to connect to ballista cluster, but documentation or something must be wrong.

https://arrow.apache.org/ballista/user-guide/python.html

To Reproduce
Steps to reproduce the behavior:
$ pip3 install ballista
$ python3

import ballista
ctx = ballista.BallistaContext("localhost", 50050)
Traceback (most recent call last):
File "", line 1, in
AttributeError: module 'ballista' has no attribute 'BallistaContext'