rc.lua: Use the new API for root.buttons

awesomerc.lua

@@ -219,11 +219,11 @@ end)
 
 -- {{{ Mouse bindings
 -- @DOC_ROOT_BUTTONS@
-root.buttons(gears.table.join(
+root.buttons = {
     awful.button({ }, 3, function () mymainmenu:toggle() end),
     awful.button({ }, 4, awful.tag.viewnext),
-    awful.button({ }, 5, awful.tag.viewprev)
-))
+    awful.button({ }, 5, awful.tag.viewprev),
+}
 -- }}}
 
 -- {{{ Key bindings