update python requirements and classifiers

Author: bkemper24

README.md

@@ -56,6 +56,9 @@ dependencies of Pandas.  If you do not already have version 0.16.0 or greater
 of Pandas installed, `pip` will install or update it for you when you
 install SWAT.
 
+If you are using `pip` version 23.1 or later to install from a tar.gz file, the
+python wheel package is required.  If you do not have this package installed,
+you can install it using `pip`.
 
 # Installation
 

doc/source/install.rst

@@ -56,6 +56,9 @@ dependencies of Pandas.  If you do not already have version 0.16 or greater
 of Pandas installed, ``pip`` or ``conda`` will install or update it for you when you
 install SWAT.
 
+If you are using ``pip`` version 23.1 or later to install from a tar.gz file, the python
+wheel package is required.  If you do not have this package installed, you can install
+it using ``pip``.
 
 PyPI
 ----

setup.py

@@ -66,6 +66,8 @@ def get_file(fname):
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
         'Topic :: Scientific/Engineering',
     ],
 )