Fix version number in Explorer

Author: c0pperdragon

EV3Explorer/MainWindow.xaml

@@ -1,7 +1,7 @@
 <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="window"
         x:Class="EV3Explorer.MainWindow"
-        Title="EV3Explorer 1.2.5" Height="600" Width="800"
+        Title="EV3Explorer 1.2.8" Height="600" Width="800"
         KeyDown="Window_keydown"
         Closing="Window_closing">
     <Grid Margin="0,0,0,0" Background="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}">