Make to make rounded background UIButton in iOS

Issue #373

UIButton.contentEdgeInsets does not play well with Auto Layout, we need to use intrinsicContentSize

final class InsetButton: UIButton {
    required init(text: String) {
        super.init(frame: .zero)

        titleLabel?.textColor = .white
        setTitle(text, for: .normal)

        layer.cornerRadius = 15
        layer.masksToBounds = true
        backgroundColor = .black
        isUserInteractionEnabled = false
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError()
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + 24, height: size.height)
    }
}