fix indent

Author: Revolyssup

apisix/discovery/nacos/factory.lua

@@ -19,7 +19,7 @@ local require            = require
 local core               = require("apisix.core")
 local http               = require('resty.http')
 local ngx                = ngx
-local ngx_re              = require('ngx.re')
+local ngx_re             = require('ngx.re')
 local utils              = require("apisix.discovery.nacos.utils")
 local string             = string
 local string_sub         = string.sub