Updated readme for "near send"

README.md

@@ -32,7 +32,7 @@ near <command>
   near view <contractName> <methodName>        # make smart contract call which can
   [args]                                       # view state
   near state <accountId>                       # view account
-  near send <receiver> <amount>                # send tokens to given receiver
+  near send <sender> <receiver> <amount>       # send tokens to given receiver
   near clean                                   # clean the build environment
   near new_project [projectDir]                # create a new blank project
   near stake [accountId] [publicKey] [amount]  # create staking transaction