Tomodachi

- Added `websocket` as a decorator type for handling websockets. A function call should return two callables which will be used for receiving messages through the socket and as a way to notify about the closure of the socket.

- Updated `aiohttp` to latest version which solves incompabilities with `yarl`.

- Added a stricter dependency check for `yarl`.

- Gracefully handle exceptions thrown when receiving messages from AWS SNS+SQS. For example when invalid XML data in response which causes botocore to throw a botocore.parsers.ResponseParserError.
- Updated dependencies to allow for newer version of aiohttp 2.3.X.
- Improved type hinting.

- Recreate queues and resubscribe to topics if queue is removed during runtime.

- Introduced new options for AWS SNS/SQS transport to use `aws_endpoint_urls` for `sns` and `sqs` if the user wishes to connect to other endpoints and the actual AWS endpoints, which could be useful for development and testing. The AWS SNS/SQS examples has been updated with values to reflect these options.
- Reworked timeouts and reconnects and fixed an issue in the recreate_client method which was called on server disconnects.