TypeError in `python -m heroprotocol --initdata --json ...`

Hi @Agilhardt,

I have [a tool to analyze my SL win rates](https://github.com/narfdotpl/hots-winrate). I used to use `heroprotocol` as a submodule. After some time of not touching the tool, I pulled the latest `heroprotocol` version to parse new replays and I've noticed that there were some breaking changes and my script no longer works. I started porting my tool to Python 3 and switched to using `heroprotocol` installed via PyPI. However when I'm trying to run it, I'm getting an error from `heroprotocol`. My tool [runs](https://github.com/narfdotpl/hots-winrate/blob/11a2c4f86d34786164f0681f53f9279b6924a271/read_replays.py#L112) `--initdata --json` and it gets:

```
> python -m heroprotocol --initdata --json '/Users/narf/github/hots-winrate/replays/2019-06-19 22.28.46 Garden of Terror.StormReplay'
Traceback (most recent call last):
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 193, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/Users/narf/.pyenv/versions/hots-winrate/lib/python3.8/site-packages/heroprotocol/__main__.py", line 10, in
hero_cli.main()
File "/Users/narf/.pyenv/versions/hots-winrate/lib/python3.8/site-packages/heroprotocol/hero_cli.py", line 96, in main
logger.log(
File "/Users/narf/.pyenv/versions/hots-winrate/lib/python3.8/site-packages/heroprotocol/hero_cli.py", line 33, in log
print(json_dumps(event, encoding='iso-8859-1'))
File "/Users/narf/.pyenv/versions/hots-winrate/lib/python3.8/site-packages/heroprotocol/compat.py", line 13, in json_dumps
return json.dumps(obj, ensure_ascii=True)
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/json/__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/json/encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/json/encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "/Users/narf/.pyenv/versions/3.8.2/lib/python3.8/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type bytes is not JSON serializable
```

When I run it without `--json` there's indeed some binary before the dictionary that I expected to read as JSON:

```
[b's2ma\x00\x00EU\x1f\x1b"\x8d\xdb\x1fr \\\xbf\xd4D\x05R\x87\x10\x0b\x0f9\x95\x9b\xe8\x16T\x81b\xe4\x08\x1e\xa8U\x11',
b's2ma\x00\x00EU\x1a\xd9L\x12n\xb9\x8aL\x1d\xe7\xb8\xe6\xf8\xaa\xa1S\xdb\xa5+\t\xd3\x82^\x0c\x89\xdb\xc5\x82'
b'\x8d\xb7\x0fv',
b's2ma\x00\x00EU\x92\xd8\x17D\xc1D\x1b\xf6(\xedj\xb7\xe9\xd1\x94\x85\xc8`\x91M\x8btZ\x91\xf65\x1f\xf9\xdc\xd4\xe6\xbb',
b's2ma\x00\x00EU\xa1\xe9\xab\xcd?\xd2PS\xc9\x03\xab\x13R\xa6\x85u7(K2\x9d\x08\xb8k+\xe2\xdeI\xc3\xab\x7fC',
b's2ma\x00\x00EU\xfex\xac\xfb\xed8\xbb\x00\x1d\xbd\xa0\xc1\x9c\xc0\x17\xf9\x02m\xb7]\xf7}\x95s\xe1\xb1*\xc3'
b'\xca\xb3\r\x92',
b's2ma\x00\x00EU%Cz9\x8d\x95\x8a\xa7\xdb|E\x104\x99\xbd\x89\xa1\xfa\x8c\xf1E\x08\xeb\xd1\xb1\xcc\x08\xdbI}\xc9\x8d']
{'m_syncLobbyState': {'m_gameDescription': {'m_cacheHandles': [b's2ma\x00\x00EU\x1f\x1b"\x8d\xdb\x1fr \\\xbf\xd4D'
b'\x05R\x87\x10\x0b\x0f9\x95\x9b\xe8\x16T\x81b\xe4\x08'
b'\x1e\xa8U\x11',
```

Here are the versions that I'm using:

```
> python --version
Python 3.8.2

> pip freeze | ag hero
heroprotocol==2.50.2.80046
```

I believe this is a bug. Or should I run the new `heroprotocol` in a different way? The only thing I'm using it for is filtering Storm League games and reading [information about players](https://github.com/narfdotpl/hots-winrate/blob/11a2c4f86d34786164f0681f53f9279b6924a271/models.py#L9-L19): their name, hero name, team, party, and whether they won.

Thanks in advance for your help.