input: Write a python function to convert a list of Celsius temperatures to Fahrenheit.
  assert convert_temps([0, 100, -40]) == [32.0, 212.0, -40.0]
  assert convert_temps([30, 20, 10, 0]) == [86.0, 68.0, 50.0, 32.0]
  assert convert_temps([-10, -20, -30]) == [14.0, -4.0, -22.0]
output: def convert_temps(celsius_list):
      return [(temp * 9/5) + 32 for temp in celsius_list]