Issue #2373197 by davidwbarratt: Reference Composer Installers as a dependency of a Drupal project

composer.json

@@ -4,6 +4,7 @@
   "type": "project",
   "license": "GPL-2.0+",
   "require": {
+    "composer/installers": "^1.0.20",
     "drupal/core": "~8.0"
   },
   "minimum-stability": "dev",