splint 1.6.0 and then of course 1.6.1 lol

Small bug fix this time:

• Fix merging defaults for --parallel and --output so they can be set by .splint.edn local config.
• Also wrote short descriptions for all empty config.edn rule descriptions.

I of course fucked up the adhoc deploy script I built, so when I pushed 1.6.0, I didn't actually tag it and didn't commit any of the changes and really just messed it all up, so I cut another release immediately. I wish I could just write the code and will it onto my user's computers.