Get rid of mypy ignores

Author: cburgdorf

eth/vm/forks/frontier/transactions.py

@@ -37,8 +37,13 @@
 
 class FrontierTransaction(BaseTransaction):
 
-    v_max = 28
-    v_min = 27
+    @property
+    def v_min(self) -> int:
+        return 27
+
+    @property
+    def v_max(self) -> int:
+        return 28
 
     def validate(self) -> None:
         validate_uint256(self.nonce, title="Transaction.nonce")

eth/vm/forks/spurious_dragon/transactions.py

@@ -59,14 +59,14 @@ def chain_id(self) -> Optional[int]:
             return None
 
     @property
-    def v_min(self) -> int:     # type: ignore
+    def v_min(self) -> int:
         if is_eip_155_signed_transaction(self):
             return 35 + (2 * self.chain_id)
         else:
             return 27
 
     @property
-    def v_max(self) -> int:     # type: ignore
+    def v_max(self) -> int:
         if is_eip_155_signed_transaction(self):
             return 36 + (2 * self.chain_id)
         else: