Log Message:
py-yarl: update to 1.6.0.

Fix dependencies.

1.6.0 (2020-09-23)
==================

Features
--------

- Allow for int and float subclasses in query, while still denying bool.
  `#492 <https://github.com/aio-libs/yarl/issues/492>`_

Bugfixes
--------

- Do not requote arguments in ``URL.build()``, ``with_xxx()`` and in ``/`` operator.
  `#502 <https://github.com/aio-libs/yarl/issues/502>`_
- Keep IPv6 brackets in ``origin()``.
  `#504 <https://github.com/aio-libs/yarl/issues/504>`_