Increased latest version to 3.1.2b0 [skip ci]

README.rst

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-   :target: https://www.idiap.ch/software/bob/docs/bob/bob.devtools/v3.1.1/index.html
+.. image:: https://img.shields.io/badge/docs-stable-yellow.svg
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-.. image:: https://gitlab.idiap.ch/bob/bob.devtools/badges/v3.1.1/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob.devtools/commits/v3.1.1
+.. image:: https://gitlab.idiap.ch/bob/bob.devtools/badges/master/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob.devtools/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob.devtools/badges/master/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob.devtools/commits/master
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    :target: https://gitlab.idiap.ch/bob/bob.devtools
 .. image:: https://img.shields.io/pypi/v/bob.devtools.svg

version.txt

-3.1.1
+3.1.2b0
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