Cancel quote

Name	Type	Required	Description
currency	string	true	BTC / ETH
quote_id	string	true	Quote id

// An example of a request message
{
    "jsonrpc" : 2.0,
    "method" : "/private/cancel_quote",
    "params" : {
        "currency":"BTC",
        "quote_id":"xxxxxxxxxx"
    },
    "id" : 1
}

// An example of a response message
{
    "jsonrpc" : 2.0,
    "method" : "/private/cancel_quote",
    "result" : "ok",
    "id" : 1
}