"""
Write a Generator function named 'fib_infinite()' to calculate fibbonacci numbers to infinity.

>>> fibo_iterator = fib_infinite()

>>> next(fibo_iterator)
0

>>> next(fibo_iterator)
1

>>> next(fibo_iterator)
1

>>> next(fibo_iterator)
2

>>> next(fibo_iterator)
3

>>> next(fibo_iterator)
5

>>> next(fibo_iterator)
8

>>> next(fibo_iterator)
13

"""
