Merge pull request #22 from php-api-clients/dependabot/composer/squizlabs/php_codesniffer-3.3.1

[Security] Bump squizlabs/php_codesniffer from 2.8.0 to 3.3.1

Author: WyriHaximus

composer.json

@@ -18,7 +18,7 @@
     "require-dev": {
         "guzzlehttp/psr7": "^1.3",
         "phpunit/phpunit": "^6.0",
-        "squizlabs/php_codesniffer": "^2.6"
+        "squizlabs/php_codesniffer": "^3.3"
     },
     "autoload": {
         "psr-4": {