Minor type annotation fix

Author: tekktrik

adafruit_tla202x/__init__.py

@@ -65,7 +65,7 @@ def add_values(
             cls.lsb[value] = lsb
 
     @classmethod
-    def is_valid(cls, value: str) -> bool:
+    def is_valid(cls, value: int) -> bool:
         "Returns true if the given value is a member of the CV"
         return value in cls.string