Unable to use expands method on NikuTextField

[y-pakorn]

expands method on nikuTextField will throw assertion error when ran because maxLines and minLines property can't be set to null.

When build this

NikuTextField("yoyo")
    .expands()
    .niku()
    .height(200)
    .width(200),

will throws

The following assertion was thrown building Builder(dirty): 
Assertion failed:
!expands || (maxLines == null && minLines == null)
"minLines and maxLines must be null when expands is true."
...

So, The expected property would be,

NikuTextField("yoyo")
    .maxLines(null) // currently not nullable
    .minLines(null) // currently not nullable
    .expands()
    .niku()
    .height(200)
    .width(200),