Python 3.10, 3.11 support

Added new wheels with support for Python 3.10 and 3.11.

Python 3.8, 3.9 support

Added new wheels with support for Python 3.8 and 3.9.

v1.8

Removes the requirement to have numpy installed before installation of s_gd2.

v1.7

• Code now runs 20% faster due to a better random number generator.
• Conda-forge should not complain due to visual c++ 2008 python2.7 compilation on Windows

v1.6

• Removed all c++11 features to satisfy conda-forge
• Fixed random seeding bug
• Removed forced dependence on matplotlib

v1.5

First release with CI to automatically build wheels and upload to PyPI