"Who's on call" returns separate messages for each result

[danoc]

We have 15+ rotations, so the script sends many messages at once which kills Hubot because of Slack rate-limiting. It'd be great if it sent all of the rotations in one message.

[technicalpickles]

This is tangentially related to https://github.com/hubot-scripts/hubot-pager-me/issues/46 for not returning all results.

[danoc]

I think you mean #43. I'll close this since they seem somewhat duplicated.