add missing comma

fixes #5

search.lua

@@ -156,7 +156,7 @@ local http, url
 -- chatcommand
 minetest.register_chatcommand("search", {
 	description = "Search for shops or bones near you. Syntax: /search [bones|shop] [<query>|*]\n"
-		.. "e.g. /search bones *"
+		.. "e.g. /search bones *",
 	func = function(playername, param)
 
 		local _, _, type, query = string.find(param, "^([^%s]+)%s+([^%s]+)%s*$")