Refactor Protocol Enums rawValue

[funcmike]

From

   public enum Kind {
        case method
        case header
        case body
        case heartbeat

        public init?(rawValue: UInt8)
        {
            switch rawValue {
            case 1:
                self = .method
            case 2:
                self = .header
            case 3:
                self = .body
            case 8:
                self = .heartbeat
            default:
                return nil
            }
        }

        public var rawValue: UInt8 {
            switch self {
            case .method:
                return 1
            case .header:
                return 2
            case .body:
                return 3
            case .heartbeat:
                return 8
            }
        }
    }
}

To

public enum Kind: UInt8 {
        case method = 1
        case header = 2
        case body = 3
        case heartbeat = 8
}