Update changes file

src/changes/changes.xml

@@ -27,6 +27,9 @@
       <action dev="luc" type="update" issue="387">
         Updated dependencies to Orekit 11.1 (and Hipparchus 2.0).
       </action>
+      <action dev="guylaine" type="update" issue="390">
+        Changed CS Group website URL.
+      </action>
     </release>
     <release version="2.2" date="2020-07-31" description="This is a minor release.
      It adds access to algorithm identifier,