#89 Add Psalm 6.

Author: hkirsman

composer.json

@@ -47,6 +47,7 @@
         "phpstan/phpstan-deprecation-rules": "^1.0",
         "nette/finder": "^2.5",
         "tomasvotruba/cognitive-complexity": "^0.1.1",
+        "vimeo/psalm": "6.x-dev",
         "webflo/drupal-finder": "^1.3"
     },
     "autoload": {
@@ -55,7 +56,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.3"
+        "phpunit/phpunit": "9.6"
     },
     "config": {
         "allow-plugins": {