arch-update: sleep 1 sec before checking

When waking up from suspend, there is sometimes a delay connecting to
the network, so arch-update gives an error

bumblebee_status/modules/contrib/arch-update.py

@@ -7,6 +7,7 @@ contributed by `lucassouto <https://github.com/lucassouto>`_ - many thanks!
 """
 
 import logging
+from time import sleep
 
 import core.module
 import core.widget
@@ -35,6 +36,7 @@ class Module(core.module.Module):
 
     def update(self):
         self.__error = False
+        sleep(1)
         code, result = util.cli.execute(
             "checkupdates", ignore_errors=True, return_exitcode=True
         )