[REL] v2.0.0

# v2.0.0

Finally the official v2.0.0 release is ready. There are no feature nor fixes since
last beta release, because it is stable.

Thank you to everyone who contributed.

## Changelog

Owl 2.0 is a large improvement over 1.0. It brings a lot of new features, improvements,
and better APIs.  The most important changes are:

- a completely overhauled slot API (in particular slot scopes, ...)
- a new reactivity system, similar to Vue. In particular, if props are equals, then
  a sub component is not updated.
- new rendering engine, based on blockdom. This makes Owl much faster
- support for fragments: a template can have an arbitrary number of roots

A detailed changelog can be found [here](CHANGELOG.md).

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@odoo/owl",
-  "version": "2.0.0-beta-22",
+  "version": "2.0.0",
   "description": "Odoo Web Library (OWL)",
   "main": "dist/owl.cjs.js",
   "module": "dist/owl.es.js",