httpx.rb in httpx-0.19.0

- old
+ new

@@ -23,9 +23,11 @@
 
 require "mutex_m"
 # Top-Level Namespace
 #
 module HTTPX
+  EMPTY = [].freeze
+
   # All plugins should be stored under this module/namespace. Can register and load
   # plugins.
   #
   module Plugins
     @plugins = {}