Merge pull request #2579 from inigoalonso/patch-1

Fix gallery link in README.rst

README.rst

@@ -137,7 +137,7 @@ External links
 -  `Chat room <https://gitter.im/vispy/vispy>`__
 -  `Developer chat room <https://gitter.im/vispy/vispy-dev>`__
 -  `Wiki <http://github.com/vispy/vispy/wiki>`__
--  `Gallery <http://vispy.org/gallery.html>`__
+-  `Gallery <http://vispy.org/gallery/index.html>`__
 -  `Documentation <http://vispy.readthedocs.org>`__
 
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