Merge branch 'fix-readme-reference' into 'master'

Fix readme reference

See merge request AlekSIS/official/AlekSIS-App-Chronos!222

README.rst

@@ -50,6 +50,6 @@ AlekSIS® is a registered trademark of the AlekSIS open source project, represen
 by Teckids e.V. Please refer to the `trademark policy`_ for hints on using the trademark
 AlekSIS®.
 
-.. _AlekSIS: https://aleksis.org/
+.. _AlekSIS®: https://aleksis.org/
 .. _European Union Public Licence: https://eupl.eu/
 .. _trademark policy: https://aleksis.org/pages/about