What Version number this messenger poses

A chat messenger is released and its version is 1.0.0 .it only posses chat functionality now. after 1 year there are different major features are added like audio/video calls, files sharing and data sharing. now what version number this chat messenger posses?

After 1 year version number will 2.0.0 Conventionally, a release number starts with a major number of one, followed by zero for its feature and maintenance numbers. This results in a release number 1.0.0. The first digit, X, is used for the major release number which is used to identify a major increase in the product functionality. The major release number is usually incremented to indicate a significant change in the product functionality or a new product base-line.