message: add example response for oauth v2
  New slack apps will use oauth v2 by default, we can explain the discrepancy to help devs get up and running faster.
diff: @@ -98,7 +98,7 @@ const adapter = new SlackAdapter({
  clientSigningSecret: process.env.SLACK_SECRET,
  clientId: process.env.CLIENTID, // oauth client id
  clientSecret: process.env.CLIENTSECRET, // oauth client secret
  - scopes: ['bot'], // oauth scopes requested
  + scopes: ['bot'], // oauth scopes requested, 'bot' depricated by Slack in favor of granular permissions
  redirectUri: process.env.REDIRECT_URI, // url to redirect post-login
  getTokenForTeam: async(team_id) => {
  // load the token for this team
  @@ -123,9 +123,9 @@ controller.webserver.get('/install/auth', (req, res) => {
  const results = await controller.adapter.validateOauthCode(req.query.code);
  // Store token by team in bot state.
  - let team = results.team_id;
  - let token = results.bot.bot_access_token;
  - let userId = results.bot.bot_user_id;
  + let team = results.team_id; // results.team.id in oauth v2
  + let token = results.bot.bot_access_token; // results.access_token in oauth v2
  + let userId = results.bot.bot_user_id; // results.bot_user_id in oauth v2
  // Securely store the token and usedId so that they can be retrieved later by the team id.
  // ...
  