Fixing help command in deprecation warning

[marcransome]

There appears to be a long-standing inconsistency in the deprecation warning regarding how to use the help command:

Deprecation: Jekyll now uses subcommands instead of just switches. Run `jekyll help' to find out more.

Leading to much hilarity:

$ jekyll help
Invalid command. Use --help for more information

Correct me if I'm wrong, but it appears that the intention was to retain the --help and --version flags, and to assume that anything else is a subcommand:

if args.size > 0 && args.first =~ /^--/ && !%w[--help --version].include?(args.first)
    ...
end

[parkr]

You're absolutely right! Thank you!