remove Travis-ci badge

Author: bnmnetp

README.rst

@@ -9,9 +9,6 @@ RunestoneComponents
    :target: https://pypi.python.org/pypi/Runestone
    :alt: PyPI Monthly downloads
 
-.. image:: https://travis-ci.com/RunestoneInteractive/RunestoneComponents.svg?branch=master
-    :target: https://travis-ci.com/RunestoneInteractive/RunestoneComponents
-
 .. image:: https://github.com/RunestoneInteractive/RunestoneComponents/workflows/Python%20package/badge.svg
 
 Packaging of the Runestone components for publishing educational materials using Sphinx and restructuredText. Check out the `Overview <http://interactivepython.org/runestone/static/overview/overview.html>`_ To see all of the extensions in action.