Download exchange rate data from Oanda

Oanda.com provides historical foreign exchange data for many currency pairs. Currency pairs are expressed as two currencies separated by a "/", where the first currency is the "base" and the second is the "quote". For example, the U.S. Dollar to Euro exchange rate would be expressed as "USD/EUR".

Since object names can't contain "/", getSymbols() will convert USD/EUR to a valid name by removing the "/". For example, getSymbols("USD/EUR") would automatically create an object named USDEUR.

Also, Oanda.com only provides historical data for the past 180 days. A warning will be thrown if you request data from more than 180 days ago, but getSymbols() will return as much data as possible. You can change the date range of your request by using the from and to arguments; both of which are dates expressed by character strings in "%Y-%m-%d" format (e.g. "2016-02-06").

Instructions

Create an object called currency_pair with the symbols for the British Pound and the Canadian Dollar so we can use this to get British Pound to Canadian Dollar exchange rate data. quantmod::oanda.currencies contains a list of currencies provided by Oanda.com.
Use getSymbols() to load data for currency_pair.
Use str() to examine the data.
Try to load data from 190 days ago to today. Remember that Sys.Date() will give you today's date.

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