Increased latest version to 2.3.8b0 [skip ci]

README.rst

@@ -5,8 +5,8 @@
    :target: http://pythonhosted.org/bob.extension/index.html
 .. image:: http://img.shields.io/badge/docs-latest-orange.png
    :target: https://www.idiap.ch/software/bob/docs/latest/bob/bob.extension/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/v2.3.7/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob.extension/commits/v2.3.7
+.. image:: https://gitlab.idiap.ch/bob/bob.extension/badges/master/build.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:: http://img.shields.io/pypi/v/bob.extension.png

version.txt

-2.3.7
+2.3.8b0
\ No newline at end of file