update zk lua

Signed-off-by: dongjiang1989 <[email protected]>

Author: dongjiang1989

apisix/discovery/zookeeper/init.lua

@@ -205,4 +205,4 @@ function _M.destroy()
     log.info("zookeeper discovery destroyed")
 end
 
-return _M
+return _M

apisix/discovery/zookeeper/schema.lua

@@ -88,4 +88,4 @@ function _M.check(conf)
     return core.schema.check(schema, conf)
 end
 
-return _M
+return _M

apisix/discovery/zookeeper/utils.lua

@@ -104,4 +104,4 @@ function _M.close_zk_client(client)
     end
 end
 
-return _M
+return _M