Lengthen masked key representation

Co-authored-by: Andy <[email protected]>

Author: ron-at-swgy

lib/serpapi/client.rb

@@ -182,7 +182,7 @@ def close
     end
 
     def inspect
-      masked_key = api_key && (api_key.length > 4 ? "#{api_key[..1]}****#{api_key[-2..]}" : '****')
+      masked_key = api_key && (api_key.length > 8 ? "#{api_key[..3]}****#{api_key[-4..]}" : '****')
       "#<#{self.class}:#{'%#016x' % (object_id << 1)} @engine=#{engine} @timeout=#{timeout} @persistent=#{persistent} api_key=#{masked_key}>"
     end