added using statement again

Signed-off-by: Matthias Weiss <[email protected]>

Author: weissm

OneMore/Commands/File/ImportCommand.cs

@@ -11,7 +11,8 @@ namespace River.OneMoreAddIn.Commands
 	using System;
 	using System.Drawing;
 	using System.IO;
-	using System.Threading;
+    using System.Text.RegularExpressions;
+    using System.Threading;
 	using System.Threading.Tasks;
 	using System.Windows.Forms;
 	using System.Xml.Linq;