Update Python version labels

Author: takuseno

setup.py

@@ -24,9 +24,9 @@
             "Intended Audience :: Science/Research",
             "Topic :: Scientific/Engineering",
             "Topic :: Scientific/Engineering :: Artificial Intelligence",
-            "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 :: Implementation :: CPython",
             "Operating System :: POSIX :: Linux",
             "Operating System :: Microsoft :: Windows",