The options were out of date (e.g. `-d` was debug). This updates them to
match the help text.
This also adds some documentation about separating the command with --
so that clap doesn't eat the flags intended for the command.
.swp files are created by vim to store editing state while a file is
open. However, it may also create .swo, .swn, etc files if .swp already
exists. Also, the temporary files are always hidden (start with ".").
Finally, vim temporarily creates .swpx files as well which are caught by
inotify.
This change fixes the *.swp pattern to only match hidden files and to
match the other vim temporary files.
