Revert "Plugin pacman_pending_updates: switch to /bin/sh; update version"

This reverts commit c9cc2f27f6.

Actually, it depends on a bashism at line 53:
  if hash checkupdates >/dev/null 2>&1; then

plugins/other/pacman_pending_updates

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 : <<=cut
 
@@ -25,7 +25,7 @@ This plugin will draw one line: the number of updates pending.
 
 =head1 VERSION
 
-  1.2.0
+  1.1.1
 
 =head1 AUTHOR