Add functionality to show only certain answers

[Tsaukpaetra]

I found it useful when there were lots of questions to only post relevant/main ones, otherwise each Slack message would be too long. This will let you select only the answers you want to see in summary.

[markfguerra]

This is a really neat feature! Thanks.

This project hasn't had my attention lately, but I will swing back to check this out when I find some time.