fix: send verification publishing message to stderr when json output

Closes: pact-foundation/pact-ruby-standalone#9

Author: bethesque

lib/pact/provider/verification_results/publish.rb

@@ -107,7 +107,7 @@ def publish_verification_results
 
           if response.code.start_with?("2")
             new_resource_url = JSON.parse(response.body)['_links']['self']['href']
-            $stdout.puts "INFO: Verification results published to #{new_resource_url}"
+            Pact.configuration.output_stream.puts "INFO: Verification results published to #{new_resource_url}"
           else
             raise PublicationError.new("Error returned from verification results publication #{response.code} #{response.body}")
           end

lib/pact/tasks/task_helper.rb

@@ -1,3 +1,4 @@
+require 'pact/configuration'
 require 'pact/provider/pact_helper_locator'
 require 'rake/file_utils'
 require 'shellwords'
@@ -36,7 +37,7 @@ def verify_command pact_helper, pact_uri, rspec_opts
     end
 
     def execute_cmd command
-      $stdout.puts command
+      Pact.configuration.output_stream.puts command
       temporarily_set_env_var 'PACT_EXECUTING_LANGUAGE', 'ruby' do
         temporarily_set_env_var 'PACT_INTERACTION_RERUN_COMMAND', PACT_INTERACTION_RERUN_COMMAND do
           exit_status = system(command) ? 0 : 1