feat(checker): Add nano Checker

[BreadGenie]

Website: https://www.nano-editor.org/
CVEs: https://www.cvedetails.com/product/19122/?q=Nano

[codecov-commenter]

Codecov Report

Merging #1277 (4238021) into main (ce9bbc1) will increase coverage by 1.59%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1277      +/-   ##
==========================================
+ Coverage   79.18%   80.77%   +1.59%     
==========================================
  Files         250      254       +4     
  Lines        4555     4573      +18     
  Branches      557      557              
==========================================
+ Hits         3607     3694      +87     
+ Misses        802      741      -61     
+ Partials      146      138       -8     

Flag	Coverage Δ
longtests	80.77% <100.00%> (+1.59%)	⬆️

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

Impacted Files	Coverage Δ
cve_bin_tool/checkers/__init__.py	95.45% <ø> (ø)
cve_bin_tool/checkers/nano.py	100.00% <100.00%> (ø)
test/test_data/nano.py	100.00% <100.00%> (ø)
test/test_data/gnomeshell.py	100.00% <0.00%> (ø)
cve_bin_tool/checkers/gnomeshell.py	100.00% <0.00%> (ø)
cve_bin_tool/cvedb.py	85.35% <0.00%> (+0.95%)	⬆️
cve_bin_tool/version_scanner.py	77.77% <0.00%> (+1.38%)	⬆️
... and 6 more

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