Created by: drien
This simply adds a -a / --any-match flag to csvgrep to allow people to use the any_match functionality of the FilteringCSVReader.
I noticed that the any_match arg has tests but isn't used anywhere, so I'm not sure whether or not it was intentionally left out of csvgrep, but I needed it for something I was working on so I figured I'd add a test and make a quick PR.
Thanks for building such a great set of tools, I use csvkit constantly!