remove travis-ci badge in README

travis-ci.org dies a while ago and the badge was displaying "no longer available"

README.rst

@@ -3,7 +3,7 @@ setuptools-py2cfg
 
 .. class:: no-web no-pdf
 
-|pypi| |build| |license|
+|pypi| |license|
 
 Since version 30.3.0, `setuptools supports`_ declarative configuration through the
 ``setup.cfg`` file. This script helps convert existing ``setup.py`` files to
@@ -162,9 +162,5 @@ Released under the terms of the `Revised BSD License`_.
     :target: https://pypi.python.org/pypi/setuptools-py2cfg
     :alt: BSD 3-Clause
 
-.. |build| image:: https://img.shields.io/travis/gvalkov/setuptools-py2cfg/master.svg?style=flat-square&label=build
-    :target: http://travis-ci.org/gvalkov/python-setuptools-py2cfg
-    :alt: Build status
-
 .. _`Revised BSD License`: https://raw.github.com/gvalkov/setuptools-py2cfg/master/LICENSE
 .. _`setuptools supports`: https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html