Automatic sizing does not attempt sizes 6-9

[jamesbowman]

With an explicit qr_type of 9, it's possible to make a large pattern

>>> import adafruit_miniqr
>>> _q = adafruit_miniqr.QRCode(qr_type = 9)
>>> _q.add_data(b"x" * 230)
>>> _q.make()
>>> _q.matrix.width
53

But attempting to do the same with automatic sizing gives an error:

>>> import adafruit_miniqr
>>> _q = adafruit_miniqr.QRCode()
>>> _q.add_data(b"x" * 230)
>>> _q.make()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/jamesb/Adafruit_CircuitPython_miniQR/adafruit_miniqr.py", line 113, in make
    self.module_count = self.type * 4 + 17
                        ~~~~~~~~~~^~~
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

From inspection, it looks like the code only attempts sizes 1-5.

[tekktrik]

Resolved by #28