Updated dependencies for CI (PHP Censor v2).

Author: corpsee

composer.json

@@ -18,6 +18,13 @@
     "php": ">=5.6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "5.7.*"
+    "phpunit/phpunit":                 "~5.7.0",
+    "codeception/codeception":         "~2.3.0",
+    "phpmd/phpmd":                     "~2.6.0",
+    "sebastian/phpcpd":                "~2.0.0",
+    "squizlabs/php_codesniffer":       "~3.5.0",
+    "php-censor/phpdoc-checker":       "^1.0",
+    "phploc/phploc":                   "~4.0.0",
+    "jakub-onderka/php-parallel-lint": "~0.9.0"
   }
 }