What is the solution to upgrade to 2.0.1? Because I get the same error as the rest but I see no solution posted.
If your updater is stuck on composer.json (as mine currently is) see here: https://community.magento.com/t5/Version-Upgrades-for-2-x/Upgrading-to-2-0-1-stuck/td-p/26815
This tool allows you to upgrade to Magento 2.0.1 automatically with ease
https://www.magentocommerce.com/magento-connect/magento-to-magento-migration-tool.html
