Update setup to use eigenpip for installation

pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools>=38", "wheel", "numpy>=1.16.4", "cython>=0.29.12","scipy>=1.2.1", "git+git://github.com/mohanwu/eigenpip.git"]
+requires = ["setuptools>=38", "wheel", "numpy>=1.16.4", "cython>=0.29.12","scipy>=1.2.1", "eigenpip @ https://github.com/mohanwu/eigenpip/archive/main.zip"]
 build-backend = "setuptools.build_meta"

setup.py

@@ -17,7 +17,7 @@
  cmdclass.update({"build_ext": build_ext})
 
 # readthedocs install 
-on_rtd = os.environ.get('READTHEDOCS') == 'True
+on_rtd = os.environ.get('READTHEDOCS') == 'True'
 
 # path to eigen library
 EIGEN_PATH = eigenpip.get_include()
@@ -104,7 +104,7 @@ def package_files(directory):
  install_requires=[
  'numpy>=1.16.4', 'scipy>=1.2.1',
  'numba>=0.51.2', 'Cython>=0.29.12',
- 'git+git://github.com/mohanwu/eigenpip.git'
+ 'eigenpip @ https://github.com/mohanwu/eigenpip/archive/main.zip'
  ],
  extras_require={
  'docs': ['sphinx', 'sphinx_rtd_theme', 'recommonmark'],