Update rector/rector requirement from ^0.15.1 to ^0.16.0 (#82)

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@0.15.1...0.16.0)

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

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composer.json

@@ -31,7 +31,7 @@
         "maglnet/composer-require-checker": "^4.2",
         "nyholm/psr7": "^1.4",
         "phpunit/phpunit": "^9.5",
-        "rector/rector": "^0.15.1",
+        "rector/rector": "^0.16.0",
         "roave/infection-static-analysis-plugin": "^1.18",
         "spatie/phpunit-watcher": "^1.23",
         "vimeo/psalm": "^4.30|^5.3",