Add DBK sentence

[JasminFragnaud]

#54

[codecov]

Codecov Report

Patch coverage: 88.88% and project coverage change: +0.14 🎉

Comparison is base (fcbe1b0) 80.24% compared to head (405170c) 80.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   80.24%   80.39%   +0.14%     
==========================================
  Files          28       29       +1     
  Lines        1058     1076      +18     
==========================================
+ Hits          849      865      +16     
- Misses        209      211       +2     

Impacted Files	Coverage Δ
src/parse.rs	71.25% <0.00%> (-0.91%)	⬇️
src/parser.rs	77.60% <0.00%> (-0.31%)	⬇️
src/sentences/mod.rs	0.00% <ø> (ø)
src/sentences/dbk.rs	100.00% <100.00%> (ø)

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[elpiel]

LGTM, small comment only for formatting.
It would be nice to improve the tests and probably the parsing too.
I can see value in skipping invalid values but if you manage to pass one of the values to still return that data and None for the rest.