WhatsApp users will either love it or despise the latest update on the app.
Have you notice a slight change in your WhatsApp? If you haven’t, here’s a hint. The app will now light up its double-check marks blue when a message has been read. In reality, the double check marks simply mean a message has been received by the other user (the single check only tells you the message reached WhatsApp’s servers).
Now there will not be anymore excuses as to saying you did not receive/read your incoming whatsapp messages!
[Source]