>>> import offlineimap.imaputil
>>> b'&g0l6Pw-'.decode('imap4-utf-7')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/ldata/src/offlineimap3/offlineimap/imaputil.py", line 406, in utf7m_decode
for c in binary.decode():
AttributeError: 'memoryview' object has no attribute 'decode'
Signed-off-by: lilydjwg <lilydjwg@gmail.com>