seleniumbase-rs 0.5.1

A patch release of the command line: it refuses again what clap refused in 0.4.0,
and sbrs-mcp names itself.

Changed

• sbrs-mcp names itself: sbrs-mcp --version prints sbrs-mcp 0.5.1, and its help
  and the usage line of an error say sbrs-mcp, where they said seleniumbase-rs.

Fixed

• A flag given twice after a subcommand, sbrs wait-for-text --css a --css b, is an
  error with status 2 again (the argument '--css' cannot be used multiple times), as it
  was with clap. 0.5.0 took the last value. A flag that is a list, such as
  deferred --assert, still repeats.
• A value written after a switch, sbrs --headless=false open ... or --help=1, is an
  error with status 2 again, as it was with clap. 0.5.0 accepted true and false
  there and ignored them.
• sbrs help nosuch, and help with any path that names no command, is an error with
  status 2 and an unrecognized subcommand message again. 0.5.0 printed the help of the
  last command it found, with status 0.