[awesomerc] Add example with real date

Signed-off-by: Julien Danjou <julien@danjou.info>

awesomerc.lua.in

@@ -212,7 +212,10 @@ end
 
 -- Hook called every second
 function hook_timer ()
-    mytextbox:set("text", os.time() .. " time_t")
+    -- For unix time_t lovers
+    mytextbox:set("text", " " .. os.time() .. " time_t ")
+    -- Otherwise use:
+    -- mytextbox:set("text", " " .. os.date() .. " ")
 end
 
 -- Set up some hooks