make_desktop_entry: add "StartupNotify=true"

I have added Sublime Text 3 to my favorites in GNOME Shell. When I
launch Sublime Text then the existing entry in the Shell/Dock is not
highlighted (marked as running) but instead a second entry is added.
I've fixed this by adding "StartupNotify=true" to the .desktop file.
make_desktop_entry: Forgot to update Manifest file
Merge branch 'Steffen185-master'
Merge branch 'master' of github.com:DamnWidget/sublime-text

Conflicts:
	app-editors/sublime-text/Manifest