Override methods can not have default values in Kotlin

[angelolloqui]

This code

class Test {
    override func dostuff(x: Int = 5) {
    }
}

gets transpiled as

class Test {
    
    override fun dostuff(x: Int = 5) {}
}

But that is not valid Kotlin for overriden methods. It should be:

class Test {
    
    override fun dostuff(x: Int) {}
}

[angelolloqui]

Fixed with #89