Increased latest version to 3.1.2b0 [skip ci]

README.rst

 .. vim: set fileencoding=utf-8 :
 .. Mon 26 Jun 2017 12:37:53 CEST
 
-.. image:: https://img.shields.io/badge/docs-v3.1.1-yellow.svg
-   :target: https://www.idiap.ch/software/bob/docs/bob/bob.extension/v3.1.1/index.html
+.. image:: https://img.shields.io/badge/docs-stable-yellow.svg
+   :target: https://www.idiap.ch/software/bob/docs/bob/bob.extension/stable/index.html
 .. image:: https://img.shields.io/badge/docs-latest-orange.svg
    :target: https://www.idiap.ch/software/bob/docs/bob/bob.extension/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/v3.1.1/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob.extension/commits/v3.1.1
-.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/v3.1.1/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob.extension/commits/v3.1.1
+.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/master/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob.extension/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/master/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob.extension/commits/master
 .. image:: https://img.shields.io/badge/gitlab-project-0000c0.svg
    :target: https://gitlab.idiap.ch/bob/bob.extension
 .. image:: https://img.shields.io/pypi/v/bob.extension.svg

version.txt

-3.1.1
+3.1.2b0
\ No newline at end of file