Fixed dependencies.

Author: corpsee

composer.json

@@ -36,6 +36,13 @@
         "nikic/php-parser": "^4.12",
         "symfony/console":  "^4.4"
     },
+    "require-dev": {
+        "phpmd/phpmd":                     "^2.10",
+        "sebastian/phpcpd":                "^4.0",
+        "squizlabs/php_codesniffer":       "^3.6",
+        "phploc/phploc":                   "^4.0",
+        "jakub-onderka/php-parallel-lint": "^1.0"
+    },
     "bin": [
         "bin/phpdoc-checker"
     ]