fix get_access_token annotation issue

lib/dingtalk/access_token.rb

@@ -7,7 +7,7 @@ module Dingtalk
 
     # 获取 access_token
     # {https://ding-doc.dingtalk.com/doc#/serverapi2/eev437}
-    # @!method get_access_token(appkey:, appsecret:)
+    # @!method get_access_token
     # @return [Hash]
     add_request :get_access_token, :get, Dingtalk::RequestUrl::ACCESS_TOKEN do |request|
       request.add_const :appkey, ->(r) { r.app_key }, in: :query