run.rb in pact-mock_service-2.9.3

- old
+ new

@@ -71,9 +71,14 @@
         log.sync = true
         log
       end
 
       def webbrick_opts
+        # By default, the webrick logs go to $stderr, which then show up as an ERROR
+        # log in pact-go, so it was changed to $stdout.
+        # $stdout needs sync = true for pact-js to determine the port dynamically from
+        # the output (otherwise it does not flush in time for the port to be read)
+        $stdout.sync = true
         opts = {
           :Port => port,
           :Host => host,
           :AccessLog => [],
           :Logger => WEBrick::BasicLog.new($stdout)