Update composer.json

Author: EmilsM

composer.json

@@ -20,7 +20,7 @@
     "phpunit/phpunit": "^6.2",
     "magento/magento-coding-standard": "5"
   },
-  "version": "5.2.0",
+  "version": "5.2.1",
   "autoload": {
     "files": [
       "registration.php"