Deprecate or replace nullableArgumentCaptor

[StefMa]

I just realized that I can't use argumentCaptor<Type?>.
I have to use the nullableArgumentCaptor for that.

After looking into the implementation I really don't get why there is an explicite argumentCaptor for nullable types.

I think most Kotlin developers would simply use argumentCaptor<Type?> and would expect that it works.

I would suggest that mockito-kotlin simply removes the nullableArgumentCatpor and return a nullable-type in the current argumentCatptor function.
What do you think?

mockito-kotlin/mockito-kotlin/src/main/kotlin/com/nhaarman/mockitokotlin2/ArgumentCaptor.kt

Lines 35 to 37 in b8f480f

	inline fun <reified T : Any> argumentCaptor(): KArgumentCaptor<T> {
	return KArgumentCaptor(ArgumentCaptor.forClass(T::class.java), T::class)
	}

mockito-kotlin/mockito-kotlin/src/main/kotlin/com/nhaarman/mockitokotlin2/ArgumentCaptor.kt

Lines 142 to 144 in b8f480f

	inline fun <reified T : Any> nullableArgumentCaptor(): KArgumentCaptor<T?> {
	return KArgumentCaptor(ArgumentCaptor.forClass(T::class.java), T::class)
	}