Increased latest version to 4.2.1b0 [skip ci]

README.rst

 .. vim: set fileencoding=utf-8 :
 .. Thu 11 Aug 14:52:51 CEST 2016
 
-.. image:: http://img.shields.io/badge/docs-v4.2.0-yellow.svg
-   :target: https://www.idiap.ch/software/bob/docs/bob/bob.measure/v4.2.0/index.html
+.. image:: http://img.shields.io/badge/docs-stable-yellow.svg
+   :target: https://www.idiap.ch/software/bob/docs/bob/bob.measure/stable/index.html
 .. image:: http://img.shields.io/badge/docs-latest-orange.svg
    :target: https://www.idiap.ch/software/bob/docs/bob/bob.measure/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob.measure/badges/v4.2.0/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob.measure/commits/v4.2.0
-.. image:: https://gitlab.idiap.ch/bob/bob.measure/badges/v4.2.0/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob.measure/commits/v4.2.0
+.. image:: https://gitlab.idiap.ch/bob/bob.measure/badges/master/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob.measure/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob.measure/badges/master/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob.measure/commits/master
 .. image:: https://img.shields.io/badge/gitlab-project-0000c0.svg
    :target: https://gitlab.idiap.ch/bob/bob.measure
 .. image:: http://img.shields.io/pypi/v/bob.measure.svg

version.txt

-4.2.0
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+4.2.1b0
\ No newline at end of file