Improve setting the authorization.

[gklijs]

Make sure there is an related issues, and the docs and unit tests are also updated.

[codecov]

Codecov Report

Merging #31 into master will increase coverage by 2.05%.
The diff coverage is 81.05%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   85.25%   87.30%   +2.05%     
==========================================
  Files           6        6              
  Lines        1478     1922     +444     
==========================================
+ Hits         1260     1678     +418     
- Misses        218      244      +26     

Impacted Files	Coverage Δ
src/lib.rs	0.00% <ø> (ø)
src/proto_raw.rs	75.55% <71.02%> (ø)
src/proto_decoder.rs	82.53% <80.00%> (+7.01%)	⬆️
src/schema_registry.rs	90.79% <90.62%> (+6.33%)	⬆️
src/proto_resolver.rs	95.55% <91.66%> (+1.43%)	⬆️
src/avro.rs	87.23% <100.00%> (ø)

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