update README.md

Author: 0xbcdev

README.md

@@ -23,13 +23,14 @@ _By setting this environment variable, you don't need to pass `--rest` flag ever
 #### Query account balance
 
 ```bash
-devd query balance [account addr] [optional ERC20 addr..] [--erc20] [--rpc http://localhost:8545]
+devd query balance [account addr] [optional ERC20 addr..] [--erc20 --rest http://localhost:1317] [--rpc http://localhost:8545]
 # devd q b 0xAccount
 # devd q b ethm1account
 # devd q b 0xAccount 0xErc20Contract
 # devd q b ethm1account 0xErc20Contract1 0xErc20Contract2
 # devd q b 0xAccount --erc20
 ```
+_`--erc20` flag, if provided, will attempt to fetch user balance of contracts on `x/erc20` module and virtual frontier bank contracts. This request additional rest endpoint provided, or use default 1317._
 
 #### Query ERC20 token information