Fixed double parsing on french computers where "125.23" wasn't parsed as double because it expected "125,23".

Two tests were failing because of this.
Used InvariantCulture to fix this instead of CurrentCulture.

Author: do0om

FluentCommandLineParser/Internals/Parsing/OptionParsers/DoubleCommandLineOptionParser.cs

@@ -38,7 +38,7 @@ public class DoubleCommandLineOptionParser : ICommandLineOptionParser<double>
 		/// <returns></returns>
 		public double Parse(ParsedOption parsedOption)
 		{
-			return double.Parse(parsedOption.Value, CultureInfo.CurrentCulture);
+			return double.Parse(parsedOption.Value, CultureInfo.InvariantCulture);
 		}
 
 		/// <summary>
@@ -49,7 +49,7 @@ public double Parse(ParsedOption parsedOption)
 		public bool CanParse(ParsedOption parsedOption)
 		{
 			double result;
-			return double.TryParse(parsedOption.Value, out result);
+            return double.TryParse(parsedOption.Value, System.Globalization.NumberStyles.Number, CultureInfo.InvariantCulture, out result);
 		}
 	}
 }