sniffer updated to 3.*

Author: splitadricejas

composer.json

@@ -32,7 +32,7 @@
   "require-dev": {
     "phpunit/phpunit": "~4.0",
     "phpdocumentor/phpdocumentor": "2.*",
-    "squizlabs/php_codesniffer": "2.*",
+    "squizlabs/php_codesniffer": "3.*",
     "rogervila/php-sonarqube-scanner": "1.1.0"
   },