Add require charging constraint

[lucas34]

No description provided.

[lucas-bot]

SwiftLint found issues

Warnings

File	Line	Reason
Constraints+Charging.swift	19	An object should only remove itself as an observer in deinit.
Constraints+Charging.swift	36	Line should be 140 characters or less: currently 170 characters

Generated by 🚫 Danger

[codecov]

Codecov Report

Merging #123 into master will increase coverage by 0.34%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   97.02%   97.36%   +0.34%     
==========================================
  Files          23       24       +1     
  Lines        1679     1707      +28     
==========================================
+ Hits         1629     1662      +33     
+ Misses         50       45       -5

Impacted Files	Coverage Δ
Sources/SwiftQueue/Constraints+Charging.swift	100% <100%> (ø)
Sources/SwiftQueue/JobBuilder.swift	100% <100%> (ø)	⬆️
Tests/SwiftQueueTests/ConstraintTests.swift	100% <100%> (ø)	⬆️
Sources/SwiftQueue/SqOperation.swift	100% <100%> (ø)	⬆️
Sources/SwiftQueue/JobInfo.swift	88% <100%> (+0.5%)	⬆️
Tests/SwiftQueueTests/SwiftQueueBuilderTests.swift	100% <100%> (ø)	⬆️
Sources/SwiftQueue/Constrains+Delay.swift	100% <0%> (+9.09%)	⬆️
Sources/SwiftQueue/Constrains+Network.swift	77.77% <0%> (+11.11%)	⬆️