Require WP-CLI v2.13 (#223)

Author: swissspidy

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "wp-cli/wp-cli": "^2.12"
+        "wp-cli/wp-cli": "^2.13"
     },
     "require-dev": {
         "wp-cli/db-command": "^1.3 || ^2",