docs: add python version classifiers to setup.cfg, fix/update readme …

…badges (#1600)

README.md

@@ -9,9 +9,13 @@
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+
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setup.cfg

@@ -16,7 +16,16 @@ classifiers =
     Development Status :: 5 - Production/Stable
     Intended Audience :: Science/Research
     License :: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+    Operating System :: Microsoft :: Windows
+    Operating System :: POSIX
+    Operating System :: Unix
+    Operating System :: MacOS
     Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3 :: Only
     Topic :: Scientific/Engineering :: Hydrology
 url = https://github.com/modflowpy/flopy