Update cython to 0.27.2

[pyup-bot]

There's a new version of cython available.
You are currently using 0.27.1. I have updated it to 0.27.2

These links might come in handy: PyPI | Changelog | Homepage | Bugtracker

Changelog

0.27.2

===================

Bugs fixed

• Comprehensions could incorrectly be optimised away when they appeared in boolean
  test contexts. (Github issue 1920)

• The special methods __eq__, __lt__ etc. in extension types did not type
  their first argument as the type of the class but object. (Github issue 1935)

• Crash on first lookup of "cline_in_traceback" option during exception handling.
  (Github issue 1907)

• Some nested module level comprehensions failed to compile.
  (Github issue 1906)

• Compiler crash on some complex type declarations in pure mode.
  (Github issue 1908)

• std::unordered_map.erase() was declared with an incorrect void return
  type in libcpp.unordered_map. (Github issue 1484)

• Invalid use of C++ fallthrough attribute before C++11 and similar issue in clang.
  (Github issue 1930)

• Compiler crash on misnamed properties. (Github issue 1905)

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[codecov]

Codecov Report

Merging #173 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #173   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         329    329           
=====================================
  Hits          329    329

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