Add vulture linter

[marcofavorito]

Proposed changes

Add vulture linter.

Fixes

n/a

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works

Further comments

n/a

[codecov]

Codecov Report

Merging #21 (ae620c6) into release (7a130a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           release      #21   +/-   ##
========================================
  Coverage    90.42%   90.42%           
========================================
  Files           16       16           
  Lines          710      710           
  Branches        59       59           
========================================
  Hits           642      642           
  Misses          53       53           
  Partials        15       15           

Flag	Coverage Δ
unittests	90.42% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[francescofuggitti]

LGTM