Fix swift 4 compiler crash

[initFabian]

No description provided.

[codecov-io]

Codecov Report

Merging #23 into master will increase coverage by 2.24%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   91.94%   94.18%   +2.24%     
==========================================
  Files          15       25      +10     
  Lines         844     1394     +550     
==========================================
+ Hits          776     1313     +537     
- Misses         68       81      +13

Impacted Files	Coverage Δ
Sources/Locksmith.swift	96.27% <ø> (ø)
Cely Demo/User.swift	0% <0%> (ø)	⬆️
Tests/CelyLocksmithTests.swift	100% <100%> (ø)	⬆️
Sources/Cely.swift	96.96% <100%> (ø)
Tests/CelyTests.swift	97.8% <100%> (ø)	⬆️
Sources/CelyLoginViewController.swift	97.05% <100%> (ø)
Sources/CelyStorage.swift	81.15% <0%> (ø)
Sources/LocksmithAccessibleOption.swift	100% <0%> (ø)
... and 8 more

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