Add link to GPLv4 badge
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		@@ -8,6 +8,7 @@ CAS Server
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    :target: https://pypi.python.org/pypi/django-cas-server
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.. image:: https://img.shields.io/pypi/l/django-cas-server.svg
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    :target: https://www.gnu.org/licenses/gpl-3.0.html
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CAS Server is a Django application implementing the `CAS Protocol 3.0 Specification
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<https://jasig.github.io/cas/development/protocol/CAS-Protocol-Specification.html>`_.
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