Vue.js has announced v2 is now released and available. Version two has been in development since April and features significant improvements over the first version. Vue V2 features better performance, server-side rendering, and the Vue tools have all been updated to support v2. The official announcement has all the details on the improvements.
For those upgrading the Vue team created a migration guide and a CLI migration helper to make it as easy as possible. However, they do note that the tool is not able to catch every deprecation, but it will help you get a good head start.
Congrats to the Vue.js team on the launch!