new aioboto context handler

[jmcgrath207]

The new aioboto forces context handlers. This is the only way I could get it working.

aiobotocore==1.0.4

import aiobotocore
session = aiobotocore.get_session()


    async with session.create_client('kinesis', region_name='us-east-1', endpoint_url=aws_endpoint) as client:
        consumer = AsyncKinesisConsumer(
            stream_name='test-stream',
            custom_kinesis_client=client)