Add composer parallet install plugin

composer.json

@@ -69,6 +69,7 @@
         "drupal/workbench": "dev-8.x-1.x",
         "drupal/workbench_access": "dev-8.x-1.x",
         "fourkitchens/emulsify": "dev-master",
+        "hirak/prestissimo": "dev-master",
         "jcalderonzumba/gastonjs": "~1.0.2",
         "jcalderonzumba/mink-phantomjs-driver": "~0.3.1",
         "mikey179/vfsStream": "~1.2",