Update to Swift 4.2

[alextall]

@initFabian The targets were still building against Swift 4.0. I've updated them to 4.2 (which should probably be marked as release 2.1) and will make another PR for 5.0 (which can then be marked as 2.2).

[initFabian]

Nice! Thanks for knocking this out. I updated documentation and tests for this build. Please review and verify on your machine everything is 👌

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 1.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #34     +/-   ##
=========================================
+ Coverage   93.96%   95.17%   +1.2%     
=========================================
  Files          25       25             
  Lines        1426     1429      +3     
=========================================
+ Hits         1340     1360     +20     
+ Misses         86       69     -17

Impacted Files	Coverage Δ
Tests/LoginViewControllerTests.swift	100% <100%> (+0.69%)	⬆️
Sources/CelyLoginViewController.swift	98.52% <100%> (+1.47%)	⬆️
Cely Demo/AppDelegate.swift	66.66% <100%> (+8.33%)	⬆️
Sources/CelyWindowManager.swift	95.23% <0%> (-4.77%)	⬇️
Sources/Locksmith.swift	97.87% <0%> (+1.59%)	⬆️
Tests/CelyStorageTests.swift	91.3% <0%> (+3.47%)	⬆️
Cely Demo/LoginStyles.swift	86.66% <0%> (+6.66%)	⬆️
Sources/CelyStorage.swift	91.3% <0%> (+10.14%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 31a0a99...ff51587. Read the comment docs.

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 1.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #34     +/-   ##
=========================================
+ Coverage   93.96%   95.17%   +1.2%     
=========================================
  Files          25       25             
  Lines        1426     1429      +3     
=========================================
+ Hits         1340     1360     +20     
+ Misses         86       69     -17

Impacted Files	Coverage Δ
Tests/LoginViewControllerTests.swift	100% <100%> (+0.69%)	⬆️
Sources/CelyLoginViewController.swift	98.52% <100%> (+1.47%)	⬆️
Cely Demo/AppDelegate.swift	66.66% <100%> (+8.33%)	⬆️
Sources/CelyWindowManager.swift	95.23% <0%> (-4.77%)	⬇️
Sources/Locksmith.swift	97.87% <0%> (+1.59%)	⬆️
Tests/CelyStorageTests.swift	91.3% <0%> (+3.47%)	⬆️
Cely Demo/LoginStyles.swift	86.66% <0%> (+6.66%)	⬆️
Sources/CelyStorage.swift	91.3% <0%> (+10.14%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 31a0a99...4a177e9. Read the comment docs.

[initFabian]

Also updated CI to use new xcode version

[alextall]

Everything looks good here.