support desc in ERC20Transfers

Author: bububa

account.go

@@ -79,7 +79,7 @@ func (c *Client) InternalTxByAddress(address string, startBlock *int, endBlock *
 // contract address and/or from/to address.
 //
 // leave undesired condition to nil.
-func (c *Client) ERC20Transfers(contractAddress, address *string, startBlock *int, endBlock *int, page int, offset int) (txs []ERC20Transfer, err error) {
+func (c *Client) ERC20Transfers(contractAddress, address *string, startBlock *int, endBlock *int, page int, offset int, desc bool) (txs []ERC20Transfer, err error) {
 	param := M{
 		"page":   page,
 		"offset": offset,
@@ -89,6 +89,12 @@ func (c *Client) ERC20Transfers(contractAddress, address *string, startBlock *in
 	compose(param, "startblock", startBlock)
 	compose(param, "endblock", endBlock)
 
+	if desc {
+		param["sort"] = "desc"
+	} else {
+		param["sort"] = "asc"
+	}
+
 	err = c.call("account", "tokentx", param, &txs)
 	return
 }