added has function

Author: denisdulici

src/Contracts/Driver.php

@@ -64,6 +64,24 @@ public function getFallback($key, $default = null)
         return Arr::get(config('setting.fallback'), $key);
     }
 
+    /**
+     * Determine if a key exists in the settings data.
+     *
+     * @param string $key
+     *
+     * @return bool
+     */
+    public function has($key)
+    {
+        if (!$this->checkExtraColumns()) {
+            return false;
+        }
+
+        $this->load();
+
+        return Arr::has($this->data, $key);
+    }
+
     /**
      * Set a specific key to a value in the settings data.
      *