Release 2.6.2

[IMPROVE] `Check` interface

[IMPROVE] `Check.nonEmpty` helper

[ADD] `Check.nonEmpty` helper

[IMPROVE] `Check.that(…)` interface

Add quick inline validation support.

Various updates with Swift 5.3 and Xcode 12, dropped support for Cart…

…hage and Cocoapods as well as dependencies on Ruby.

[FIX] current version in ‘podspec’ file

[UPDATE] ‘ReadMe’ and ‘PrepareForCarthage’ files.

[ADD] ‘CocoaPods’ support