#390, #396, #407: Drop async, send_doc(), Documents BBC

• Upgrade to DuniterPy v1.0.0rc0
• Remove asynctest and pytest-asyncio no longer required dependencies
• Handle DuniterPy v1.0 Documents BBC
• Refactor test_generate_and_send_transaction()
• Implement generic send_document()
• Remove async/await keywords from tests/test_*.py
• Remove async kw from tests/patched
• wot: Handle 404 error not found exception
• Remove client.close() now in DuniterPy
• Remove aiohttp module usage
• Remove async/await keywords

Close #3 (closed), #260 (closed), #390 (closed), #396 (closed), #407 (closed).