Update config.php

Use .env to store STEAM API KEY

Author: ee

src/config/config.php

@@ -6,5 +6,5 @@
 	 * You can get a steam API key from http://steamcommunity.com/dev/apikey
 	 * Once you get your key, add it here.
 	*/
-	'steamApiKey' => 'YOUR-API-KEY',
+	'steamApiKey' => env('STEAM_APIKEY'),
 );