sage-utils-python v0.5.6

Updated dependencies to the latest releases:

• aioamqp to 0.12.0
• flake8 to 3.6.0 (for development)
• pudb 2018.1 (for development)
• pytest to 4.0.2
• pytest-cov to 2.6.0
• pytest-asyncio to 0.9.0