🐧 Hide the 'Install update' menu.

menus/linux.cson

@@ -147,7 +147,6 @@
       { label: '&About Atom...', command: 'application:about' }
       { label: 'View &License', command: 'application:open-license' }
       { label: "VERSION", enabled: false }
-      { label: "Install &update", command: 'application:install-update', visible: false }
       { type: 'separator' }
       { label: '&Documentation', command: 'application:open-documentation' }
       { type: 'separator' }