2.0.0 is out

The 2.0.0 release in almost fully backward compatible with the 1.x branch.

For the list of breaking changes, have a look to the UPGRADING document. Most of them are edge-cases that might affect your application if you were relying on them.

For a list of merged pull requests, have a look to the 2.0 milestone

There are no new features in the 2.0.0 release compared to 1.5.0.
The 2.0.0 release has the main goal of changing some configuration defaults, that in most of the cases bring performance improvements or improve the DX by providing a better error handling and a more predictable application behaviour.