feat: show hint how many lines to cover to reach threshold

[bartveneman]

closes #32

[codecov-commenter]

Bundle Report

Bundle size has no change ✅

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.11%. Comparing base (1d70494) to head (6cc0f47).

Files with missing lines	Patch %	Lines
src/cli/reporters/pretty.ts	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
- Coverage   98.20%   98.11%   -0.10%     
==========================================
  Files          14       14              
  Lines         892      900       +8     
  Branches      106      107       +1     
==========================================
+ Hits          876      883       +7     
- Misses         14       15       +1     
  Partials        2        2              

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