Popular messaging app WhatsApp Messenger is being updated with one-tap voice messaging, allowing users who have difficult-to-type languages to communicate with each other across various platforms. WhatsApp has been working on the feature for about six months, wanting to make voice messaging simpler and easier to use than other apps with the functionality, CEO Jan Koum told AllThingsD in an interview.With the updated WhatsApp, a user pushes to record a message rather than type one. When she lets go, the message sends. If she decides not to send, she swipes to the left and the recording is deleted. All that is