Set python min version to 3.8

Python 3.6 reached end-of-life on Dec 12, 2021.

.github/workflows/cmake.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-18.04, ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.6', '3.9']
+        python-version: ['3.8', '3.10']
 
     steps:
       - uses: actions/checkout@v3

README.md

@@ -69,7 +69,7 @@ The software is tested on the following platforms.
   * Windows x64
   * macOS
 
-A Python binding is available to access the library. It is supported on Python versions 3.6 through 3.9.
+A Python binding is available to access the library. It is supported on Python versions 3.8 through 3.10.
 
 ### Installing
 

setup.py

@@ -31,15 +31,15 @@
     long_description=README,
     long_description_content_type='text/markdown',
     license="3-clause BSD",
-    python_requires='>=3.6',
+    python_requires='>=3.8',
     install_requires=['six>=1.11'],
     packages=[MAIN_PACKAGE],
     include_package_data=True,
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
         'License :: OSI Approved :: BSD License',
-        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: C',
         'Intended Audience :: End Users/Desktop',
         'Intended Audience :: Science/Research',