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

Author: jcnventura

composer.json

@@ -26,7 +26,7 @@
         "ext-xml": "*",
         "composer/installers": "^1.2",
         "composer/semver": "^1.4",
-        "cweagans/composer-patches": "^1.6",
+        "cweagans/composer-patches": "^1.6.5",
         "drupal-composer/preserve-paths": "^0.1",
         "drupal/composer_autoloader": "^1.0",
         "drupal/drupal": "~7.0",