Improve restore

[jinSasaki]

#26
#36

[codecov]

Codecov Report

Merging #42 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   95.25%   95.25%           
=======================================
  Files           6        6           
  Lines         253      253           
=======================================
  Hits          241      241           
  Misses         12       12

Impacted Files	Coverage Δ
Sources/InAppPurchase.swift	100% <100%> (ø)	⬆️
Sources/Internal/Internal+InAppPurchase.swift	94.87% <100%> (ø)	⬆️

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