Removed forwardable dependency

Author: anakinj

lib/jwt/jwk/rsa.rb

@@ -1,16 +1,10 @@
 # frozen_string_literal: true
 
-require 'forwardable'
-
 module JWT
   module JWK
     class RSA
-      extend Forwardable
-
       attr_reader :keypair
 
-      def_delegators :keypair, :private?, :public_key
-
       BINARY = 2
       KTY    = 'RSA'.freeze
 
@@ -20,6 +14,14 @@ def initialize(keypair)
         @keypair = keypair
       end
 
+      def private?
+        keypair.private?
+      end
+
+      def public_key
+        keypair.public_key
+      end
+
       def kid
         sequence = OpenSSL::ASN1::Sequence([OpenSSL::ASN1::Integer.new(public_key.n),
                                             OpenSSL::ASN1::Integer.new(public_key.e)])