Support for Swift 4

[yaslab]

No description provided.

[codecov]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   92.22%   92.22%           
=======================================
  Files          11       11           
  Lines        1145     1145           
=======================================
  Hits         1056     1056           
  Misses         89       89

Impacted Files	Coverage Δ
Sources/CSVWriter.swift	82.22% <ø> (ø)	⬆️
Sources/CSVReader.swift	88.2% <ø> (ø)	⬆️
Tests/CSVTests/Version1Tests.swift	87.95% <100%> (ø)	⬆️

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