Mocks for available(iOS xxx) build error with Stubber variant

[JiceDessaint]

SwiftyMocky 4.0.1 (Cocoapods integration) + SwiftymockyCLI 4.0.1

Got an error when mocking following protocol:

//sourcery: AutoMockable
protocol SomeProtocol {
    @available(iOS 12.0, *)
    func funcA() -> String
}

will produce following code for stubbing method:

        @available(iOS 12.0, *)
	public static func funcA(willReturn: String...) -> MethodStub { ... }
        public static func funcA(willProduce: (Stubber<String>) -> Void) -> MethodStub {
               // Missing @available
        }

willReturn variant is good, but stubber version miss the available annotation, resulting in compilation error 'm_funcA' is only available in iOS 12.0 or newer

[g-amichnia]

Fixed.