Displays error when invalid argument added to command

[brunats]

- What I did

Added validation of arguments in commands, commands 'leaf' (don't have subcommands) presents an error when other arguments are informed.

- How to verify it

Clone this pr with the command

git fetch upstream pull/530/head:fix/displays-error-when-invalid-argument-added-to-command

And run commands with invalid arguments

git checkout fix/displays-error-when-invalid-argument-added-to-command
make build && cp dist/linux/rit /usr/local/bin/

rit list repo ritchie #  Run and see error
rit list repo #  Run

rit list # Run and see the suggestions

- Description for the changelog

Displays error when invalid argument added to command

[codecov-commenter]

Codecov Report

Merging #530 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #530   +/-   ##
=======================================
  Coverage   79.23%   79.23%           
=======================================
  Files          96       96           
  Lines        4157     4157           
=======================================
  Hits         3294     3294           
  Misses        641      641           
  Partials      222      222           

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