Minor typos and fixes and updated requirement for Python >= 3.8

asyncevents/constants.py

@@ -14,7 +14,7 @@ from enum import Enum, auto, EnumMeta
 class ContainsEnumMeta(EnumMeta):
     """
     Simple metaclass that implements
-    the item in self operation
+    the 'item in self' operation
     """
 
     def __contains__(cls, item):

setup.py

@@ -28,5 +28,5 @@ if __name__ == "__main__":
             "Operating System :: OS Independent",
             "License :: OSI Approved :: Apache Software License",
         ],
-        python_requires=">=3.6",
+        python_requires=">=3.8",
     )