Updated to PHP_CodeSniffer 3.4.0

Author: michalbundyra

composer.json

@@ -20,7 +20,7 @@
         "php": "^7.1",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
         "slevomat/coding-standard": "^4.8.0",
-        "squizlabs/php_codesniffer": "^3.3.2",
+        "squizlabs/php_codesniffer": "^3.4.0",
         "webimpress/coding-standard": "dev-master"
     },
     "extra": {