#191: PHP 7.4 compatibility

- update PHP_CodeSniffer version

Author: lenaorobei

composer.json

@@ -9,7 +9,7 @@
     "version": "5",
     "require": {
         "php": ">=5.6.0",
-        "squizlabs/php_codesniffer": "^3.4",
+        "squizlabs/php_codesniffer": "^3.5",
         "webonyx/graphql-php": ">=0.12.6 <1.0"
     },
     "require-dev": {