Increased stable version to 6.0.0

README.rst

 .. vim: set fileencoding=utf-8 :
 
-.. image:: http://img.shields.io/badge/docs-stable-yellow.svg
-   :target: https://www.idiap.ch/software/bob/docs/bob/bob/stable/index.html
+.. image:: http://img.shields.io/badge/docs-v6.0.0-yellow.svg
+   :target: https://www.idiap.ch/software/bob/docs/bob/bob/v6.0.0/index.html
 .. image:: http://img.shields.io/badge/docs-latest-orange.svg
    :target: https://www.idiap.ch/software/bob/docs/bob/bob/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob/badges/master/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob/commits/master
-.. image:: https://gitlab.idiap.ch/bob/bob/badges/master/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob/badges/v6.0.0/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob/commits/v6.0.0
+.. image:: https://gitlab.idiap.ch/bob/bob/badges/v6.0.0/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob/commits/v6.0.0
 .. image:: https://img.shields.io/badge/gitlab-project-0000c0.svg
    :target: https://gitlab.idiap.ch/bob/bob
 .. image:: http://img.shields.io/pypi/v/bob.svg

version.txt

-6.0.0b0
+6.0.0
\ No newline at end of file