Cancel inquiry

Name	Type	Required	Description
currency	string	true	BTC / ETH
inquiry_id	string	true	Inquiry id

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

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