Swifterswift: Mutating versions of removeDuplicates(keyPath:)

[RomanPodymov]

• [x] 🚀 I've read, understood, and done my best to follow the Contributing guidelines before opening this issue.

Currently there are nonmutating withoutDuplicates() and mutating removeDuplicates() in extension Array. Let's add mutating versions of func withoutDuplicates<E: Equatable>(keyPath path: KeyPath<Element, E>) -> [Element] and func withoutDuplicates<E: Hashable>(keyPath path: KeyPath<Element, E>) -> [Element].

SwifterSwift Environment

• SwifterSwift version: 5.0.0
• Xcode version: 10.3
• macOS version running Xcode: 10.14.6
• Swift version: 5.0
• Platform(s) running SwifterSwift: macOS

[i5glu]

I can handle it :)

[LucianoPAlmeida]

Thank's @RomanPodymov @iglushchuk :)