Update phpcs and phpunit

Author: MBoretto

composer.json

@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "php": ">=5.5.0",
+        "php": ">=7.1.3",
         "ext-pdo": "*",
         "ext-curl": "*",
         "monolog/monolog": "^1.19",
@@ -35,7 +35,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8",
-        "squizlabs/php_codesniffer": "~2.5"
+        "phpunit/phpunit": "^8.5",
+        "squizlabs/php_codesniffer": "3.5.*"
     }
 }