Instagram pushed out version 2.0.1 of its mega-popular, iOS-only photo-sharing app today. In addition to routine bug-fixing and a few other minor features, the update makes changes to two of the app's photo filters, which were overhauled with the release of Instagram 2.0 two weeks go. It was the 2.0 upgrade that offered Instagram users the most dramatic reworking of the app's camera feature yet.