update classifiers

Author: MuellerSeb

pyproject.toml

@@ -29,11 +29,11 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "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",
+    "Programming Language :: Python :: 3.11",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: GIS",
     "Topic :: Scientific/Engineering :: Hydrology",