getset does not to_bytes the value

[bmerry]

In 0.9.0, the implementation of getset doesn't pass the value through to_bytes (unlike set).

This leads to problems like the following:

>>> f = fakeredis.FakeStrictRedis()
>>> f.getset('key', 3)
>>> f.append('key', 'hello')
TypeError: unsupported operand type(s) for +=: 'int' and 'str'

I have a fix in a branch I am preparing for a PR.

[bmerry]

Fixed in 0.10.1.