Update rector/rector requirement from ^0.18.0 to ^0.19.0 (#45)

Updates the requirements on [rector/rector](https://github.com/rectorphp/rector) to permit the latest version.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@0.18.0...0.19.0)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-type: direct:development
...

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composer.json

@@ -40,7 +40,7 @@
         "codeception/codeception": "^5.0",
         "codeception/module-cli": "^2.0",
         "maglnet/composer-require-checker": "^4.2",
-        "rector/rector": "^0.18.0",
+        "rector/rector": "^0.19.0",
         "vimeo/psalm": "^4.30|^5.2"
     },
     "autoload": {