input: Write a python function to convert a list of temperatures from Celsius to Fahrenheit and vice versa.
  assert convert_temps([0, 100], 'C_to_F') == [32.0, 212.0]
  assert convert_temps([32, 212], 'F_to_C') == [0.0, 100.0]
  assert convert_temps([-40, 100], 'C_to_F') == [-40.0, 212.0]
  assert convert_temps([212, 32], 'F_to_C') == [100.0, 0.0]
output: def convert_temps(temps, conversion_type):
      if conversion_type == 'C_to_F':
          return [(temp * 9/5) + 32 for temp in temps]
      elif conversion_type == 'F_to_C':
          return [(temp - 32) * 5/9 for temp in temps]