Write a function that takes hours parked, integer, and is_member, boolean, and returns the fee to pay:
  - First hour is free
  - Members pay $1/hour
  - Non-members pay $2/hour
  - Max fee is $10

Example:
>>> calculate_fee(1, True)
0
>>> calculate_fee(3, True)
2
>>> calculate_fee(3, False)
4