Merge pull request #13 from magento-borg/MAGETWO-89569

Update composer/composer dependency

Author: slavvka

composer.json

@@ -9,7 +9,7 @@
   ],
   "require": {
     "php": "~7.1.3|~7.2.0",
-    "composer/composer": "~1.6.0",
+    "composer/composer": "^1.6",
     "symfony/console": "~4.0.0"
   },
   "require-dev": {