Fixes a JSONUnkeyedDecodingContainer bug

[fabianfett]

No description provided.

[codecov]

Codecov Report

Merging #41 into master will increase coverage by 0.16%.
The diff coverage is 93.05%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   90.79%   90.96%   +0.16%     
==========================================
  Files          42       42              
  Lines        3293     3309      +16     
==========================================
+ Hits         2990     3010      +20     
+ Misses        303      299       -4     

Impacted Files	Coverage Δ
...Coding/Decoding/JSONUnkeyedDecodingContainer.swift	95.04% <88.23%> (+0.36%)	⬆️
...s/Decoding/JSONUnkeyedDecodingContainerTests.swift	90.74% <94.54%> (+1.73%)	⬆️
...linux/debug/testlist.derived/JSONCodingTests.swift	100.00% <0.00%> (ø)
...PackageTestsTestlist.derived/JSONCodingTests.swift	100.00% <0.00%> (ø)

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