Making --use-root-maintainers available via CLI

[gagoar]

It was reported that --use-root-maintainers is not explicitly available via the CLI.

This PR should solved that, and close #344

[coveralls]

Pull Request Test Coverage Report for Build 4458422274

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 4368655577:	0.0%
Covered Lines:	245
Relevant Lines:	245

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💛 - Coveralls

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ad51db5) 100.00% compared to head (9198ed5) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #345   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          262       262           
  Branches        57        57           
=========================================
  Hits           262       262           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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