Latest version of json gem compatibility issue

[tsogbadrakh-qp]

Latest working version was ~> 2.10.0, and starting from 2.11 will throw the following error.

Minitest::UnexpectedError:         NoMethodError: undefined method `call' for an instance of Hash
            /usr/local/bundle/gems/json-2.11.3/lib/json/common.rb:36:in `block in object_class_proc'
            /usr/local/bundle/gems/json-2.11.3/lib/json/common.rb:47:in `block in array_class_proc'
            /usr/local/bundle/gems/json-2.11.3/lib/json/common.rb:336:in `parse'
            /usr/local/bundle/gems/json-2.11.3/lib/json/common.rb:336:in `parse'
            /usr/local/bundle/gems/quickpay-ruby-client-3.0.2/lib/quickpay/api/client.rb:56:in `block (2 levels) in <class:Client>'