Add touchscreen tap event processing

Thanks to Lasse Yledahl, see PR #3
Removes the problems in PR #2

README.md

@@ -6,13 +6,13 @@ By Romano Giannetti <romano@rgtti.com> , <romano.giannetti@gmail.com>
 
 Most laptops have a key combination (usually some Fn-*thing*) to enable/disable the touchpad.
 But not all of them. My Lenovo Yoga L13, for example, doesn't have one.
-This extension just enables/disables the touchpad; 
+This extension just enables/disables the touchpad;
 by default, it restores the touchpad in the enabled state when you logout and login,
 but you can choose just to remember the old state in the options.
 
 ### Features
 
-Click on the icon to change from Touchpad On to Off. 
+Click (or tap with a touchscreen, [thanks to Lasse Yledahl](https://github.com/Rmano/gse-touchpad-onoff/pull/3)) on the icon to change from Touchpad On to Off.
 
 Each click toggle the status.
 
@@ -28,7 +28,7 @@ Each click toggle the status.
 ### I'm stuck!
 
 If you are stuck without mouse or touchpad, open a terminal window
-or the command prompt of gnome-shell (with Alt-F2) and issue 
+or the command prompt of gnome-shell (with Alt-F2) and issue
 
     dconf write /org/gnome/desktop/peripherals/touchpad/send-events true
 

TouchpadOnOff@romano.rgtti.com/metadata.json

@@ -8,5 +8,5 @@
   "url": "https://github.com/Rmano/gse-touchpad-onoff",
   "uuid": "TouchpadOnOff@romano.rgtti.com",
   "settings-schema": "org.gnome.shell.extensions.touchpadonoff",
-  "version": 4
+  "version": 5
 }