Chore: changelog and how to release for v2.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## v2.0.0
+
+This releases completely reworks py3dtiles command line and add new features.
+
+The command line now uses subcommands syntax, in order to expose a single
+entry point and support multiple commands. The existing commands 'export_tileset' and 'py3dtiles_info' became
+'py3dtiles export' and 'py3dtiles info'.
+
+### Changes
+
+- relicensed as Apache 2.0.
+- minimal python supported is now 3.7
+- dependencies versions has been updated:
+    - laspy should be at least 2.0
+    - numpy at least 1.20.0
+- Tile has been renamed to TileContent
+
+### Features
+
+New features were added, the main one being: py3dtiles can be used to convert
+pointcloud las files to a 3dtiles tileset.
+
+This is the purpose of the 'py3dtiles convert' command. It supports multicore
+processor for faster processing, leveraging pyzmq, and the memory management has been carefully
+implemented to support virtually unlimited points count.
+
+Other features:
+
+- read points from xyz files
+- Documentation are now published at https://oslandia.gitlab.io/py3dtiles
+
+### Fixes
+
+* 53580ba Jeremy Gaillard       fix: use y-up orientation for glTF objects in export script  
+* 65d6f67 Jeremy Gaillard       fix: proper bounding box size in export script  
+* 3603b00 Augustin Trancart     fix: reliably select triangulation projection plane and orientation  
+* fd2105a jailln                Fix gltf min and max value

HOW_TO_RELEASE.md

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+# How to release
+
+- edit the CHANGELOG.md
+- edit the version in `py3dtiles/__init__.py`
+- publish on pypi
+
+Check if the doc for the new version is published.