boost_error=True creates invalid QR Codes

[heuer]

>>> import segno
>>> qr = segno.make('http://www.example.org/bla/bla/')
>>> qr.show()  # Does not scan
>>> qr.designator
'3-H'
>>> qr = segno.make('http://www.example.org/bla/bla/', boost_error=False)
>>> qr.show()  # Works!
>>> qr.designator
'3-M'
>>> # Setting the error level to 'H' works, too
>>> qr = segno.make('http://www.example.org/bla/bla/', error='h')
>>> qr.show()  # Works!
>>> qr.designator
'4-H'
>>> # boost_error should choose error level "Q" which does not change the QR Code version
>>> qr = segno.make('http://www.example.org/bla/bla/', boost_error=False, error='q')
>>> qr.show()  # Works!
>>> qr.designator
'3-Q'