Merge pull request #26 from weierophinney/feature/psalm-integration

Provide Psalm integration

Author: weierophinney

composer.json

@@ -55,7 +55,9 @@
         "mongodb/mongodb": "^1.1.0",
         "phpspec/prophecy-phpunit": "^2.0",
         "phpunit/phpunit": "^9.3",
-        "symfony/yaml": "^2.3 || ^3.0 || ^4.0 || ^5.0"
+        "psalm/plugin-phpunit": "^0.16.1",
+        "symfony/yaml": "^2.3 || ^3.0 || ^4.0 || ^5.0",
+        "vimeo/psalm": "^4.8"
     },
     "conflict": {
         "doctrine/dbal": "<2.12.0",