Limit CamperBot's thanks list to 1 or 2 people

[mstellaluna]

As per Quincy, to prevent brownie/cookie spamming we need to limit camperbot's repeat thanks to one or two people at a time rather than allowing a large list of people. This needs to apply to all rooms in the FCC Chat.

[psyperl]

could this solve the limit? at thanks.js

if (mentions.length > 2) {     
  return null;
}

i tried to pull request .. but failed on continuous integration.. wonder how i can see the log of the integration

[ojongerius]

I've got this running locally but need to polish it before I submit a PR. Will do that after this weekend.