resolve "add subscriber welcome message" (#65) (!41) · Merge requests · team-friendo / signalboost

responds to a subscriber sending "JOIN" with a welcome message explaining signalboost and how to use it.

side-effects:

fix bug in subscriber add command response call in executor (omitted channel as arg)
extract/rewrite blurb and support message strings
fix bug in ADD/REMOVE error messages (still contained "ADMIN")

resolve "add subscriber welcome message" (#65)