Symengine

A post1 release to fix the windows wheels

Breaking Changes
* Python<3.6 support including Python 2 support was dropped
* When building from source on Windows, MSVC dev environment has to be activated
beforehand or CMAKE_GENERATOR has to be explicitly set
* is_zero now returns None if the property cannot be determined instead of raising

New Features
* PyPy support
* ppc64le, arm64 support
* Added UnevaluatedExpr
* Added support to pass a Basic object's C++ object pointer using pycapsules
* Add new matrix methods elementwise_mul, conjugate and conjugate_transpose

Bug Fixes
* Workaround for DLL loading changes in python>=3.8.
Set "SYMENGINE_PY_ADD_PATH_TO_SEARCH_DIRS" env variable if built from source
on Windows.

People who contributed to the release:
* Isuru Fernando
* Jialin Ma
* Rikard Nordgren
* Rohit Goswami

New Features:
- LLVM Lambdify takes a dtype argument now - 309
- Use xreplace from C++ instead of subs - 313

People who contributed to the release:
- Isuru Fernando

New Features:

- Update to libsymengine 0.6.0
- Add new function linsolve

People who contributed to the release:

- Isuru Fernando

Breaking Changes
* python 3.4 support is dropped. (2.7 will be dropped in the next version)

Bug Fixes:
* Fixes for sympy compatibility
* Added opt_level to Lambdify llvm backend.

People who contributed to the release:
* Simon Stelter
* Björn Dahlgren
* Isuru Fernando

Dependencies
- Updated symengine C++ library requirement to v0.5.0

Bug Fixes
- Fix converting large Integers to python ints - 289
- Fix DeprecationWarning for MutableMapping import - 295

New Features
- as_ctypes function for Lambdify - 292
- Make LambdaDouble and LLVMDouble cimport-able - 288
- Add QR and Cholesky factorizations - 298

People who contributed to the release:
* Richard Otis
* Isuru Fernando
* Erik Jansson Agnvall
* Björn Dahlgren
* Connor Behan