Update integration_tests/samples/oauth/oauth_v2.py
Update integration_tests/samples/oauth/oauth_v2.py

Co-authored-by: Steve Gill <b97873f2aeca990d3cb9e81e50523f723f18d92e@gmail.com>
slackapi/python-slackclient,slackhq/python-slackclient,slackapi/python-slackclient,slackapi/python-slackclient