yarl 1.6.1 release

Features

• Provide wheels for aarch64, i686, ppc64le, s390x architectures on
  Linux as well as x86_64.
  #507 <https://github.com/aio-libs/yarl/issues/507>_
• Provide wheels for Python 3.9.
  #526 <https://github.com/aio-libs/yarl/issues/526>_

Bugfixes

• human_repr() now always produces valid representation equivalent to the original URL (if the original URL is valid).
  #511 <https://github.com/aio-libs/yarl/issues/511>_
• Fixed requoting a single percent followed by a percent-encoded character in the Cython implementation.
  #514 <https://github.com/aio-libs/yarl/issues/514>_
• Fix ValueError when decoding % which is not followed by two hexadecimal digits.
  #516 <https://github.com/aio-libs/yarl/issues/516>_
• Fix decoding % followed by a space and hexadecimal digit.
  #520 <https://github.com/aio-libs/yarl/issues/520>_
• Fix annotation of with_query()/update_query() methods for key=[val1, val2] case.
  #528 <https://github.com/aio-libs/yarl/issues/528>_

Removal

• Drop Python 3.5 support; Python 3.6 is the minimal supported Python version.