Update to Swift 5.1.5

[Andrea-Scuderi]

No description provided.

[codecov-io]

Codecov Report

Merging #9 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   97.81%   97.74%   -0.08%     
==========================================
  Files           3        3              
  Lines         229      177      -52     
==========================================
- Hits          224      173      -51     
+ Misses          5        4       -1

Impacted Files	Coverage Δ
...ambdaSwiftSprinterNioPlugin/NIOLambdaHandler.swift	96.51% <0%> (-0.86%)	⬇️
Sources/LambdaSwiftSprinterNioPlugin/Utils.swift	97.14% <0%> (-0.64%)	⬇️
...es/LambdaSwiftSprinterNioPlugin/LambdaApiNIO.swift	100% <0%> (+1.42%)	⬆️

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