Allow JSON extension points.

[fabianfett]

No description provided.

[codecov]

Codecov Report

Merging #46 into master will decrease coverage by 0.01%.
The diff coverage is 88.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   90.76%   90.74%   -0.02%     
==========================================
  Files          39       39              
  Lines        3301     3296       -5     
==========================================
- Hits         2996     2991       -5     
  Misses        305      305              

Impacted Files	Coverage Δ
...PureSwiftJSONTests/Decoding/JSONDecoderTests.swift	92.95% <80.00%> (-0.80%)	⬇️
Sources/PureSwiftJSON/Decoding/JSONDecoder.swift	100.00% <100.00%> (ø)
Sources/PureSwiftJSON/Encoding/JSONEncoder.swift	91.48% <100.00%> (+0.18%)	⬆️

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