Using output instead of echo

Author: steverobbins

src/MageDownload/Command/AbstractCommand.php

@@ -216,6 +216,6 @@ protected function outputFormatJson($messages)
                 }
             }
         }
-        echo json_encode($json);
+        $this->output->write(json_encode($json), false, OutputInterface::OUTPUT_RAW);
     }
 }