fix documentation on config file (#14)

Author: ziming

README.md

@@ -26,10 +26,15 @@ This is the contents of the published config file:
 return [
     'api_key' => env('SCRAPINGBEE_API_KEY'),
     'base_url' => env('SCRAPINGBEE_BASE_URL', 'https://app.scrapingbee.com/api/v1/'),
-    'timeout' => env('SCRAPINGBEE_TIMEOUT', 120),
-    
+    'timeout' => env('SCRAPINGBEE_TIMEOUT', 140),
+
     'google_search_base_url' => env('SCRAPINGBEE_GOOGLE_SEARCH_BASE_URL', 'https://app.scrapingbee.com/api/v1/store/google'),
+
     'walmart_search_base_url' => env('SCRAPINGBEE_WALMART_SEARCH_BASE_URL', 'https://app.scrapingbee.com/api/v1/walmart/search'),
+    'walmart_product_base_url' => env('SCRAPINGBEE_WALMART_PRODUCT_BASE_URL', 'https://app.scrapingbee.com/api/v1/walmart/product'),
+
+    'amazon_search_base_url' => env('SCRAPINGBEE_AMAZON_SEARCH_BASE_URL', 'https://app.scrapingbee.com/api/v1/amazon/search'),
+    'amazon_product_base_url' => env('SCRAPINGBEE_AMAZON_PRODUCT_BASE_URL', 'https://app.scrapingbee.com/api/v1/amazon/product'),
 ];
 ```