@slack/bolt@2.1.0

• Integrated the Slack OAuth package into Bolt-js. Checkout the Bolt-js docs to learn more! (#479) - Thanks @stevengill
• changed deprecated usage of res.send to res.status(500).send() (#487) - Thanks @dburandt
• updates to docs (#477) - Thanks @shaydewael
• Added type aliases for RadioButton and Checkbox (#471) - Thanks @yoichiro