Add link to upgrade notes.
Add link to upgrade notes.

jschlyter/simplesamlphp,jschlyter/simplesamlphp,simplesamlphp/simplesamlphp,ghalse/simplesamlphp,jschlyter/simplesamlphp,dnmvisser/simplesamlphp,sitya/simplesamlphp,dnmvisser/simplesamlphp,dnmvisser/simplesamlphp,jschlyter/simplesamlphp,sitya/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,sitya/simplesamlphp,jschlyter/simplesamlphp,sitya/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp