docs: adjust copyright holder info

Vasek has been working for CESNET for quite some time, let's adjust
this.

Change-Id: I64b801a03caeb14ad6a46a49a99f2ca8db698d0f
diff --git a/README.md b/README.md
index 5ea87be..e4184eb 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@
 
 ## Credits
 
-Copyright © Faculty of Information Technology, Czech Technical University in Prague, https://fit.cvut.cz/ .
 Copyright © CESNET, https://www.cesnet.cz/ .
-Most of the code was written by Václav Kubernát (FIT ČVUT) and Jan Kundrát (CESNET).
+Portions copyright © Faculty of Information Technology, Czech Technical University in Prague, https://fit.cvut.cz/ .
+Most of the code was written by Václav Kubernát (CESNET, formerly FIT ČVUT) and Jan Kundrát (CESNET).
 The project is distributed under the terms of the Apache 2.0 license.