Fix #1212

Author: cdujeu

core/src/plugins/editor.etherpad/etherpad-client/etherpad-lite-client.php

@@ -50,6 +50,7 @@ protected function call($function, array $arguments = array(), $method = 'GET')
       $c = curl_init($url);
       curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
       curl_setopt($c, CURLOPT_TIMEOUT, 20);
+      curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
       if ($method === 'POST') {
         curl_setopt($c, CURLOPT_POST, true);
         curl_setopt($c, CURLOPT_POSTFIELDS, $arguments);