Add draft of new release

_posts/2023-09-27-cityjson-v20.md

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+---
+layout: post
+title: CityJSON v2.0 is released!
+categories: news
+date: 2023-09-27 15:59
+---
+
+![]({{ site.baseurl }}/assets/images/cityjson_logo_v2.svg)
+
+We've been working hard, in collaboration with [Geonovum](https://www.geonovum.nl/), on improving CityJSON and we're happy today to release version 2.0 🎉🍾🚀
+
+
+## The full specifications
+
+[CityJSON v2.0.0 specifications]({{ site.baseurl }}/specs/2.0.0/)
+
+
+## Software 
+
+Perhaps more importantly, we have updated the eco-systems:
+
+  - [cjio](https://github.com/cityjson/cjio) has been updated to v0.7 and offers an upgrade operator to automatically upgrade your existing files
+  - [cjval (the official validator)](https://validator.cityjson.org/)
+  - you can [upgrade your files automatically and pain-free]({{ site.baseurl }}/tutorials/upgrade20/)
+  - [the online view ninja](https://ninja.cityjson.org/) supports v2.0 already 
+
+Other software like [azul](https://github.com/tudelft3d/azul), [FME](https://github.com/safesoftware/fme-CityJSON/), and [citygml4j](https://github.com/citygml4j/citygml-tools) will be updated soon.
+
+## Developer?
+
+If you are a developer, you can see [on this page]({{ site.baseurl }}/dev/upgrade20/) what you need to do to update your code to be ready for v1.1 files.
+Most changes are small, and we expect this upgrade to take a maximum of a few minutes.
+
+