Update cython to 0.26

[pyup-bot]

There's a new version of Cython available.
You are currently using 0.25.2. I have updated it to 0.26

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

Changelog

0.26

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

Features added

• Pythran can be used as a backend for evaluating NumPy array expressions.
  Patch by Adrien Guinet (Github issue 1607).

• cdef classes now support pickling by default when possible.
  This can be disabled with the auto_pickle directive.

• Speed up comparisons of strings if their hash value is available.
  Patch by Claudio Freire (Github issue 1571).

• Support pyximport from zip files.
  Patch by Sergei Lebedev (Github issue 1485).

• IPython magic now respects the __all__ variable and ignores
  names with leading-underscore (like import * does).
  Patch by Syrtis Major (Github issue 1625).

• abs() is optimised for C complex numbers.
  Patch by da-woods (Github issue 1648).

• The display of C lines in Cython tracebacks can now be enabled at runtime
  via import cython_runtime; cython_runtime.cline_in_traceback=True.
  The default has been changed to False.

• The overhead of calling fused types generic functions was reduced.

• "cdef extern" include files are now also searched relative to the current file.
  Patch by jdemeyer (Github issue 1654).

• Optional optimization for re-aquiring the GIL, controlled by the
  fast_gil directive.

Bugs fixed

• Item lookup/assignment with a unicode character as index that is typed
  (explicitly or implicitly) as Py_UCS4 or Py_UNICODE used the
  integer value instead of the Unicode string value. Code that relied on
  the previous behaviour now triggers a warning that can be disabled by
  applying an explicit cast. (Github issue 1602)

• f-string processing was adapted to changes in PEP 498 and CPython 3.6.

• Invalid C code when decoding from UTF-16(LE/BE) byte strings.
  (Github issue 1696)

• Unicode escapes in 'ur' raw-unicode strings were not resolved in Py2 code.
  Original patch by Aaron Gallagher (Github issue 1594).

• File paths of code objects are now relative.
  Original patch by Jelmer Vernooij (Github issue 1565).

• Decorators of cdef class methods could be executed twice.
  Patch by jdemeyer (Github issue 1724).

• Several warnings in the generated coder are now suppressed.

Other changes

• The unraisable_tracebacks option now defaults to True.

• Coercion of C++ containers to Python is no longer automatic on attribute
  access (Github issue 1521).

• Access to Python attributes of cimported modules without the corresponding
  import is now a compile-time (rather than runtime) error.

• Do not use special dll linkage for "cdef public" functions.

• cdef/cpdef methods must match their declarations. See Github Issue 1732.
  This is now a warning and will be an error in future releases.

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

Happy merging! 🤖