Reset GUI on disconnect, mention serial driver in Readme

README.md

 
 This project emulates a virtual Gamepad using input data from a serial port. This can be used to enable Flysky CT6A / CT6B compatible transmitters (Turbobrix, Exceed, Modelcraft) in games or simulators.
 
+Depending on the USB-Serial converter stick included with your Transmitter, you may need to install the [SiLabs CP210x driver](https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx).
+
 You need to install the virtual userspace IOKit HID driver [foohid](https://github.com/unbit/foohid).
 
 Download the latest release **including foohid** [here on GitHub](https://github.com/xythobuz/SerialGamepad/releases).

SerialGamepad/Info.plist

 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>91</string>
+	<string>93</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>

SerialGamepad/Thread.m

         }
     }
     
+    // Ensure the GUI is always reset after clicking Disconnect
+    NSArray *zero = [NSArray arrayWithObjects:[NSNumber numberWithInt:0], [NSNumber numberWithInt:0], [NSNumber numberWithInt:0], [NSNumber numberWithInt:0], [NSNumber numberWithInt:0], [NSNumber numberWithInt:0], nil];
+    [mainWindow performSelectorOnMainThread:@selector(setChannels:) withObject:zero waitUntilDone:NO];
+    
     close(fd);
     NSLog(@"Connection closed...\n");
     fd = -1;