Update link to SPDX license list (#58)

Author: fkohrt

index.html

@@ -80,7 +80,7 @@ <h1>CodeMeta generator v3.0</h1>
                 <!-- This datalist is be filled automatically -->
 
                 <br />
-                <span class="field-description" id="licenses_descr">from <a href="https://spdx.org/license-list">SPDX licence list</a></span>
+                <span class="field-description" id="licenses_descr">from <a href="https://spdx.org/licenses/">SPDX licence list</a></span>
 
                 <div id="selected-licenses">
                     <!-- This div is to be filled as the user selects licenses -->