set python_requires to >=3.8

Author: benbariteau

setup.py

@@ -53,5 +53,5 @@
             'pytest',
         ],
     },
-    python_requires='!=3.0,!=3.1,!=3.2,!=3.3,!=3.4,!=3.5.0',
+    python_requires='>=3.8',
 )