use chartjs from composer

Author: melanger

composer.json

@@ -23,6 +23,7 @@
         "simplesamlphp/simplesamlphp": "~1.17",
         "simplesamlphp/composer-module-installer": "~1.0",
         "cesnet/simplesamlphp-module-perunauthorize": "~2.0",
+        "cesnet/simplesamlphp-module-chartjs": "~2.8.0",
         "ext-curl": "*",
         "ext-json": "*"
     }

templates/listOfSps-tpl.php

@@ -212,6 +212,6 @@ function getClass($attribute)
 
 ?>
 
-<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.js"></script>
+<script src="<?php echo htmlspecialchars(\SimpleSAML\Module::getModuleURL('chartjs/Chart.bundle.min.js'));?>"></script>
 
 <script src="<?php echo htmlspecialchars(\SimpleSAML\Module::getModuleURL('perun/listOfSps.js'));?>"></script>