Add format.showOnlyFirstParagraph:

[k1LoW]

ref: #211

[codecov]

Codecov Report

Merging #325 (94b2904) into main (6826b6d) will decrease coverage by 0.20%.
The diff coverage is 35.29%.

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
- Coverage   66.96%   66.75%   -0.21%     
==========================================
  Files          26       26              
  Lines        4313     4328      +15     
==========================================
+ Hits         2888     2889       +1     
- Misses       1138     1151      +13     
- Partials      287      288       +1     

Impacted Files	Coverage Δ
config/config.go	48.78% <ø> (ø)
output/output.go	0.00% <0.00%> (ø)
output/md/md.go	68.90% <100.00%> (+0.21%)	⬆️
datasource/datasource.go	40.14% <0.00%> (-2.12%)	⬇️

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