Remove unused loader argument from Plugin initializer

History.md

@@ -10,6 +10,9 @@
   * Your bugfix goes here (#Github Number)
   * Windows update extconf.rb for use with ssp and varied Ruby/MSYS2 combinations (#2069)
 
+* Refactor
+  * Remove unused loader argument from Plugin initializer (#2095)
+
 ## 4.3.1 and 3.12.2 / 2019-12-05
 
 * Security

lib/puma/plugin.rb

@@ -10,7 +10,7 @@ module Puma
 
     def create(name)
       if cls = Plugins.find(name)
-        plugin = cls.new(Plugin)
+        plugin = cls.new
         @instances << plugin
         return plugin
       end
@@ -104,10 +104,6 @@ module Puma
       Plugins.register name, cls
     end
 
-    def initialize(loader)
-      @loader = loader
-    end
-
     def in_background(&blk)
       Plugins.add_background blk
     end