Apple has confirmed that it has added an “Offers In-App Purchases” line to freemium apps found in the App Store. Currently, the line is only found within the iTunes desktop version of the App Store. The company recently settled a class action lawsuit over freemium apps aimed at children, but as one British boy showed during an in-app spending spree, freemium purchases remain an issue. The disclosure offers a somewhat more conspicuous up-front…