clean() got an unexpected keyword argument 'styles'

[dsimandl]

Unsurprisingly this looks like its not compatible with Bleach 5.0.0 due to that styles kwarg change. We've had the the older version of bleach pinned for a while but would it be possible update this library to support Bleach 5.0.0? I can create a PR with the change if needed (seems fairly straightforward?)