Insert the default values on the README.

Hello! I was using the library for the first time on a recent project and I thought it would be useful if the default values were displayed in the README's table. I missed that. So I've edited the file myself and I'm sending it to you to you guys think about it. The table may not be looking very beautiful right now but I really think it will be useful when a developer will be using it for the first time. Hope you guys agree. Regards, Gio.