[#1478] Update to new release.


Problem description
===================

During the previous merge, we forgot to increase the version number.


Why we got into this (5 whys)
=============================

* Bad reviewers :)
* Lack of automated check in PQM


Changes description
===================

Release 0.9.0

I have already published chevah-compat-0.9.0


How to try and test the changes
===============================

reviewers @alibotean @bnickname 

Check that everything is ok.

Thanks!