Drop asynchronous property
- [x] Update to DunitePy v1.0 which removes the asynchronous property, removes `aiohttp` and adds `websocket-client` dependencies - In runtime and tests environments remove: - [x] `async`/`await` keywords - [x] `client.close()` which is now handled by DuniterPy after each request - Clean other stuff - [x] Remove `pytest-asyncio` and `asynctest` dev dependencies
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