Fix linter.

contracts/drafts/ERC777/ERC777.sol

@@ -27,13 +27,14 @@ contract ERC777 is IERC777, IERC20 {
 
     // We inline the result of the following hashes because Solidity doesn't resolve them at compile time.
     // See https://github.com/ethereum/solidity/issues/4024.
-    //
+
     // keccak256("ERC777TokensSender")
     bytes32 constant private TOKENS_SENDER_INTERFACE_HASH =
-      0x29ddb589b1fb5fc7cf394961c1adf5f8c6454761adf795e67fe149f658abe895;
+        0x29ddb589b1fb5fc7cf394961c1adf5f8c6454761adf795e67fe149f658abe895;
+
     // keccak256("ERC777TokensRecipient")
     bytes32 constant private TOKENS_RECIPIENT_INTERFACE_HASH =
-      0xb281fc8c12954d22544db45de3159a39272895b169a852b314f9cc762e44c53b;
+        0xb281fc8c12954d22544db45de3159a39272895b169a852b314f9cc762e44c53b;
 
     // This isn't ever read from - it's only used to respond to the defaultOperators query.
     address[] private _defaultOperatorsArray;