What's the difference between release 1.1.1, 1.2.0 and 3.0.0?

[sam liu]

Hi Experts,

Who can answer my following questions? We want to know which release is
suitable to us.Thanks a lot!

- What's the difference between release 1.1.1, 1.2.0 and 3.0.0?
- What are their release time?

Sam Liu