added completion for notify-send command

completion/available/notify-send.completion.bash

@@ -0,0 +1,20 @@
+if _binary_exists notify-send
+then
+    function __notify-send_completions ()
+    {
+        local curr=$(_get_cword)
+        local prev=$(_get_pword)
+
+        case $prev in
+            -u|--urgency)
+                COMPREPLY=($(compgen -W "low normal critical" -- "$curr"))
+            ;;
+            *)
+                COMPREPLY=($(compgen -W "-? --help -u --urgency -t --expire-time -a --app-name -i --icon -c --category -h --hint -v --verison" -- "$curr"))
+            ;;
+        esac
+    }
+
+
+    complete -F __notify-send_completions notify-send
+fi