Convert version number to string

[314eter]

Fixes #37.

[xevilstar]

latest git just cloned make make install restarted session ....

TypeError: Me.metadata.version is undefined

Stack trace:
aboutPage@/home/xevilstar/.local/share/gnome-shell/extensions/quick-settings-tweaks@qwreey/prefPages/about.js:33:17
fillPreferencesWindow@/home/xevilstar/.local/share/gnome-shell/extensions/quick-settings-tweaks@qwreey/prefs.js:18:20
_init@resource:///org/gnome/Shell/Extensions/js/extensionPrefsDialog.js:27:29
ExtensionPrefsDialog@resource:///org/gnome/Shell/Extensions/js/extensionPrefsDialog.js:10:4
OpenExtensionPrefsAsync@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:124:33
async*_handleMethodCall@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:368:35
_wrapJSObject/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:401:34
run@resource:///org/gnome/Shell/Extensions/js/dbusService.js:186:20
main@resource:///org/gnome/Shell/Extensions/js/main.js:22:13
run@resource:///org/gnome/gjs/modules/script/package.js:206:19
start@resource:///org/gnome/gjs/modules/script/package.js:190:8
@/usr/share/gnome-shell/org.gnome.Shell.Extensions:1:17

[xevilstar]

#39 (comment)

fixed the issue