Bump minimum required composer-patches version to support default patch level (#410)

Author: mxr576

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "composer/installers": "^1.2",
-        "cweagans/composer-patches": "^1.6",
+        "cweagans/composer-patches": "^1.6.5",
         "drupal-composer/drupal-scaffold": "^2.5",
         "drupal/console": "^1.0.2",
         "drupal/core": "~8.5.3",