Fixed Package.swift

[terwanerik]

SPM was complaining that the directory structure didn't match up, it's usually in the format Sources/{Name}/* instead of the current Sources/*. Updated the Package.swift file to target the right directory.

[codecov]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #39   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         226    226           
=====================================
  Hits          226    226

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[omaralbeik]

Thanks 💯