Fix binary bodies

[garnaat]

This PR includes a different approach to fix the same issue described in #70. Creating the PR so others can test to verify it fixes the issue (or not).

[adhorn]

Works like a charm for me with AppConfig.

Directory already exists
Recording
+++++ <botocore.response.StreamingBody object at 0x1057d6210>
+++++ <class 'botocore.response.StreamingBody'>
+++++ b'{ "is_enabled": "maybe", "error_code": 404, "exception_msg": "This is chaos", "rate": 0.5, "fault_type": "latency"}'
+++++ <class 'bytes'>
+++++ 2021-09-27 08:29:58.473000+00:00
+++++ <class 'datetime.datetime'>
+++++ 2021-09-27 08:29:58.473000+00:00
+++++ <class 'datetime.datetime'>

[garnaat]

Great! I'm going to merge and then make a new placebo release for the first time in ~ 2.5 years 8^)