Update README

[Miouge1]

This patch updates the README file with the latest --help output.

[codecov]

Codecov Report

Merging #40 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   39.04%   39.04%           
=======================================
  Files           1        1           
  Lines         210      210           
=======================================
  Hits           82       82           
  Misses        122      122           
  Partials        6        6

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[negz]

Thanks @Miouge1 !