Update Gnosis Safe tx format

safe.gnosis.io.md

@@ -34,17 +34,30 @@ There is currently no endpoint to pull the transactions from.
 
 ### Tx
 ```
-function executeSubscription(
-        address from, //the subscriber
-        address to, //the publisher
-        address tokenAddress, //the token address paid to the publisher
-        uint256 tokenAmount, //the token amount paid to the publisher
-        uint256 periodSeconds, //the period in seconds between payments
-        uint256 gasPrice, //the amount of tokens or eth to pay relayer (0 for free)
-        bytes signature //proof the subscriber signed the meta trasaction
+    /// @dev Allows to execute a Safe transaction confirmed by required number of owners and then pays the account that submitted the transaction.
+    ///      Note: The fees are always transfered, even if the user transaction fails. 
+    /// @param to Destination address of Safe transaction.
+    /// @param value Ether value of Safe transaction.
+    /// @param data Data payload of Safe transaction.
+    /// @param operation Operation type of Safe transaction.
+    /// @param safeTxGas Gas that should be used for the Safe transaction.
+    /// @param dataGas Gas costs for data used to trigger the safe transaction and to pay the payment transfer
+    /// @param gasPrice Gas price that should be used for the payment calculation.
+    /// @param gasToken Token address (or 0 if ETH) that is used for the payment.
+    /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
+    /// @param signatures Packed signature data ({bytes32 r}{bytes32 s}{uint8 v})
+    function execTransaction(
+        address to, 
+        uint256 value, 
+        bytes data, 
+        Enum.Operation operation, 
+        uint256 safeTxGas,
+        uint256 dataGas,
+        uint256 gasPrice,
+        address gasToken,
+        address refundReceiver,
+        bytes signatures
     )
-        public
-        returns (bool success)
 ```
 
 Please check https://github.com/gnosis/safe-contracts for further details and context.