Slider uses visitor from pattern-validator

[rpiazza]

make slider work with base visitor from pattern-validator

[codecov-io]

Codecov Report

Merging #38 into master will increase coverage by 1.25%. The diff coverage is 65.02%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   64.93%   66.19%   +1.25%     
==========================================
  Files          17       12       -5     
  Lines        5062     2896    -2166     
==========================================
- Hits         3287     1917    -1370     
+ Misses       1775      979     -796

Impacted Files	Coverage Δ
stix2slider/options.py	70.12% <100%> (+0.19%)	:arrow_up:
stix2slider/__init__.py	40.84% <100%> (-0.83%)	:arrow_down:
stix2slider/test/test_idioms.py	77.87% <100%> (+0.19%)	:arrow_up:
stix2slider/convert_pattern.py	58.91% <56.72%> (+0.54%)	:arrow_up:
stix2slider/convert_stix.py	66.12% <65.82%> (-0.36%)	:arrow_down:
stix2slider/common.py	82.05% <69.23%> (+0.71%)	:arrow_up:
stix2slider/convert_cyber_observables.py	73.04% <71.17%> (-0.47%)	:arrow_down:

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[rpiazza]

@clenk

If you review latest changes and merge this - I can do the release.