Decimal symbol

[Inkosi]

HI,

First of all great work and it help me a lot, but i think that i found an issue.
You are only assuming that the decimal symbol is '.' but it can be also ',' (European countries use this symbol)
So in the method ParsePriceAsync, inside Historical class, when you call Convert.ToDouble it will raise an exception. Before the cycle 'For' you need to add this line to don't have any problem with the decimal symbol
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;