Amazon has updated its Kindle app to include a 'Get Book' button, allowing users to purchase books directly within the app.Previous to this update, users had to go to Safari to buy books, but now they can complete purchases through the mobile web browser.Amazon's Tim Gillman confirmed the update, stating it aims to enhance customer convenience.The change is a response to Judge Gonzalez Rodgers' contempt order, with the possibility of other companies following suit.