version v2.0.0
version v2.0.0

Bumped major version up as there are some compatibility breaks.

At same time, update link to mbed-client-c as it is changed too.

ARMmbed/mbed-client,tridonic-com/mbed-client,tridonic-com/mbed-client,ARMmbed/mbed-client,tridonic-com/mbed-client,ARMmbed/mbed-client