Fix lowercase unicode escaped sequence

[fabianfett]

No description provided.

[codecov]

Codecov Report

Merging #42 into master will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   90.96%   91.05%   +0.09%     
==========================================
  Files          42       41       -1     
  Lines        3309     3265      -44     
==========================================
- Hits         3010     2973      -37     
+ Misses        299      292       -7     

Impacted Files	Coverage Δ
Sources/PureSwiftJSONParsing/DocumentReader.swift	93.10% <100.00%> (+0.19%)	⬆️
Tests/JSONParsingTests/StringParserTests.swift	100.00% <100.00%> (ø)
...sts/LearningTests/FoundationJSONEncoderTests.swift	91.83% <0.00%> (-1.15%)	⬇️
...sts/LearningTests/FoundationJSONDecoderTests.swift	93.29% <0.00%> (-0.08%)	⬇️
...inux/debug/testlist.derived/JSONParsingTests.swift	100.00% <0.00%> (ø)
...ackageTestsTestlist.derived/JSONParsingTests.swift	100.00% <0.00%> (ø)
...arningTests/FoundationJSONSerializationTests.swift

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