Merge pull request #18 from bob-frost/ruby2.2.0

Error "can't dup Fixnum (TypeError)"

lib/telegram/bot/async.rb

@@ -116,7 +116,7 @@ module Telegram
 
       attr_reader :id
 
-      def initialize(*, id: nil, async: nil, **)
+      def initialize(*, id: nil, async: nil, **options)
         @id = id
         self.async = async
         super

lib/telegram/bot/botan/client_helpers.rb

@@ -5,7 +5,7 @@ module Telegram
       module ClientHelpers
         attr_reader :botan
 
-        def initialize(*, botan: nil, **)
+        def initialize(*, botan: nil, **options)
           super
           @botan = Botan.wrap(botan, id: id) if botan
         end