docopt.cr

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With [docopt.rb](https://github.com/docopt/docopt.rb/blob/master/lib/docopt.rb) I can put some colorization on my docopt help message. Eg. code https://github.com/noraj/haiti/blob/a8fefceb94d32d2b00fdbb31ad46c725451b588d/bin/haiti#L11-L50 Eg. output  But with [docopt.cr](https://github.com/chenkovsky/docopt.cr/blob/master/src/docopt.cr) it breaks the parsing. Eg. colors on usage: ```crystal...

noraj

Use delegate instead of inheriting Array(String)

1

Having Tokens inherit Array(String) was breaking unrelated code because of https://github.com/crystal-lang/crystal/issues/11734 This PR removes the inheritance and replaces it with composition and usage of the delegate macro

ralsina