Drop requirement from PHP 7.1 to 7.0

Author: GaryJones

composer.json

@@ -22,14 +22,22 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "php": "^7.1",
+        "php": "^7.0",
         "composer/installers": "~1.4",
         "roave/security-advisories": "dev-master"
     },
     "require-dev": {
-        "dealerdirect/phpcodesniffer-composer-installer": "^0.4",
+        "php": "^7.1",
+        "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3",
         "object-calisthenics/phpcs-calisthenics-rules": "^3",
+        "squizlabs/php_codesniffer": "3.1",
         "wimg/php-compatibility": "dev-master",
         "wp-coding-standards/wpcs": "dev-develop"
+    },
+    "scripts": {
+        "install-codestandards": [
+            "Dealerdirect\\Composer\\Plugin\\Installers\\PHPCodeSniffer\\Plugin::run"
+        ],
+        "phpcs": "phpcs && phpcs ./genesis-js-no-js.php -sp --standard=PHPCompatibility --runtime-set testVersion 5.2"
     }
 }