Declare package as Python 3.8-3.11 (#146)

Author: abukaj

setup.py

@@ -25,8 +25,11 @@ def readme():
           'Development Status :: 4 - Beta',
           'License :: OSI Approved :: BSD License',
           'Natural Language :: English',
-          'Programming Language :: Python :: 2',
           'Programming Language :: Python :: 3',
+          'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9',
+          'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11',
           'Operating System :: OS Independent',
           'Topic :: Scientific/Engineering :: Medical Science Apps.',
           'Intended Audience :: Science/Research',