Change the version to start at 2.0.0

[nickguimond]

The documentation around task router V1 and V2 is very confusing. It would be helpful if this project started in the V2 semver range. Perhaps even a note in the readme to indicate there is an older version and main differences.

[AndreyTwilio]

Thank you @nickguimond , it's a very good advice, now we have changed versioning so that it start with 2.x.x