Provide CVSS information when available.

[nicholasks]

This will allow Safety-CLI users to have access when CVSS information is available on meta.

And only visible when using --full-report. Here some example (not a real vuln):

[rafaelpivato]

LGTM

@nicholasks can you update this from master branch, add documentation and HISTORY changes?

[codecov]

Codecov Report

Merging #324 (23b234f) into master (b289752) will decrease coverage by 2.07%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   71.59%   69.51%   -2.08%     
==========================================
  Files           8        8              
  Lines         514      538      +24     
==========================================
+ Hits          368      374       +6     
- Misses        146      164      +18     

Impacted Files	Coverage Δ
safety/formatter.py	50.87% <10.00%> (-5.42%)	⬇️
safety/safety.py	93.18% <100.00%> (+0.21%)	⬆️

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[nicholasks]

LGTM

@nicholasks can you update this from master branch, add documentation and HISTORY changes?

@rafaelpivato done!