HARMONY-1838: Clarify supported python versions

https://devguide.python.org/versions/

README.md

@@ -12,7 +12,7 @@ We welcome feedback on Harmony-Py via [GitHub Issues](https://github.com/nasa/ha
 
 ## Prerequisites
 
-* Python 3.8+
+* Python 3.8 through 3.11 (other versions are end of life or untested)
 
 
 ## Installing
@@ -28,7 +28,7 @@ This will install harmony-py and its dependencies into your current Python envir
 
 ## Prerequisites
 
-* Python 3.7+, ideally installed via a virtual environment
+* Python 3.8 through 3.11, ideally installed via a virtual environment
 
 
 ## Installing Development & Example Dependencies

setup.py

@@ -48,8 +48,6 @@ def get_version():
         'Intended Audience :: Science/Research',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
@@ -58,7 +56,7 @@ def get_version():
     ],
     keywords='nasa, harmony, remote-sensing, science, geoscience',
     packages=find_packages(exclude=['tests']),
-    python_requires='>=3.6, <4',
+    python_requires='>=3.8, <4',
     install_requires=DEPENDENCIES,
     extras_require={
         'dev': DEV_DEPENDENCIES,