Changes from comments on PR ethereum#3030 & minor cleanup

ens/async_ens.py

@@ -140,7 +140,7 @@ def from_web3(cls, w3: "AsyncWeb3", addr: ChecksumAddress = None) -> "AsyncENS":
     async def address(
         self,
         name: str,
-        coin_type: int = None,
+        coin_type: Optional[int] = None,
     ) -> Optional[ChecksumAddress]:
         """
         Look up the Ethereum address that `name` currently points to.
@@ -170,7 +170,7 @@ async def setup_address(
         address: Union[Address, ChecksumAddress, HexAddress] = cast(
             ChecksumAddress, default
         ),
-        coin_type: int = None,
+        coin_type: Optional[int] = None,
         transact: Optional["TxParams"] = None,
     ) -> Optional[HexBytes]:
         """
@@ -186,6 +186,7 @@ async def setup_address(
         :param str address: name will point to this address, in checksum format.
             If ``None``, erase the record. If not specified, name will point
             to the owner's address.
+        :param int coin_type: if provided, set up the address for this coin type
         :param dict transact: the transaction configuration, like in
             :meth:`~web3.eth.Eth.send_transaction`
         :raises InvalidName: if ``name`` has invalid syntax

ens/contract_data.py

@@ -5,6 +5,8 @@
 This contract data is taken form the actual ENS contracts deployed on mainnet.
 The information was taken from etherscan.io and may need to be updated as the ENS 
 contracts are updated. 
+
+https://etherscan.io/accounts/label/ens
 """
 
 # ENS Default Registrar

ens/ens.py

@@ -187,7 +187,7 @@ def setup_address(
         :param str address: name will point to this address, in checksum format.
             If ``None``, erase the record. If not specified, name will point
             to the owner's address.
-        :param int coin_type: if provided, set the address for this coin type
+        :param int coin_type: if provided, set up the address for this coin type
         :param dict transact: the transaction configuration, like in
             :meth:`~web3.eth.Eth.send_transaction`
         :raises InvalidName: if ``name`` has invalid syntax