Add timeout for hook/service

The script might get stuck or have issues.
This should never get the pacman update stuck.
To avoid the issue this adds timeout to the pacman hook.
A tiemout is also added to the service to avoid taking system resouces when there is an issue.

Fixes #11

fox-neat-wallpaper.hook

@@ -8,4 +8,4 @@ Target = *
 Description = Updating fox-neat-wallpaper for relevant users
 Depends = imagemagick
 When = PostTransaction
-Exec = /bin/bash /opt/fox-neat-wallpaper/hook-script.sh
+Exec = /bin/timeout 2m /bin/bash /opt/fox-neat-wallpaper/hook-script.sh

fox-neat-wallpaper.service

@@ -4,6 +4,7 @@ Description=Update fox-neat-wallpaper for running user
 [Service]
 Type=simple
 ExecStart=/bin/bash /opt/fox-neat-wallpaper/fox-neat-wallpaper.sh update
+TimeoutSec=2min
 
 [Install]
 WantedBy=default.target