Module stability

[kishikawakatsumi]

Swift 5.1 provides module stability. It means no longer needs to re-build binaries when compiler upgraded. BUILD_LIBRARY_FOR_DISTRIBUTION = YES; generates .moduleinterface to provide module stability.

[codecov]

Codecov Report

Merging #453 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
- Coverage   90.43%   90.43%   -0.01%     
==========================================
  Files           1        1              
  Lines        1767     1766       -1     
==========================================
- Hits         1598     1597       -1     
  Misses        169      169

Impacted Files	Coverage Δ
Lib/KeychainAccess/Keychain.swift	90.43% <0%> (-0.01%)	⬇️

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