Lua 5.5.0 Release (#2119)

* Lua 5.5 beta

* lua 5.5.0 release

Author: cloudwu

3rd/lua/README

@@ -1,6 +1,5 @@
-This is a modify version of lua 5.4.7 .
+This is a modify version of lua 5.5 .
 
 For detail ,
   Shared Proto : http://lua-users.org/lists/lua-l/2014-03/msg00489.html
   Shared short string table : http://blog.codingnow.com/2015/08/lua_vm_share_string.html
-  Signal for debug use : http://blog.codingnow.com/2015/03/skynet_signal.html