docs: update license information

Author: sbillinge

LICENSE-DANSE.rst

@@ -9,14 +9,11 @@ Copyright 2006-2007, Board of Trustees of Michigan State University,
 Copyright 2008-2012, The Trustees of Columbia University in the
 City of New York.  (Copyright holder indicated in each source file).
 
-Copyright (c) 2024, The Trustees of Columbia University in the City of New York.
-All rights reserved.
-
 For more information please visit the project web-page:
 
     http://www.diffpy.org/
 
-or email Prof. Simon Billinge at sb2896@columbia.edu
+or email Prof. Simon Billinge at sbillinge@ucsb.edu
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions

LICENSE.rst

@@ -18,6 +18,9 @@ Copyright (c) 2014-2019, Brookhaven Science Associates, Brookhaven National Labo
 Copyright (c) 2024-2025, The Trustees of Columbia University in the City of New York.
 All rights reserved.
 
+Copyright (c) 2026-present, The Contributors to the diffpy.structure project.
+All rights reserved.
+
 The "DiffPy-CMI" is distributed subject to the following license conditions:
 
 .. code-block:: text

docs/source/license.rst

@@ -25,6 +25,9 @@ Copyright (c) 2014-2019, Brookhaven Science Associates, Brookhaven National Labo
 Copyright (c) 2024-2025, The Trustees of Columbia University in the City of New York.
 All rights reserved.
 
+Copyright (c) 2026-present, The Contributors to the diffpy.structure project.
+All rights reserved.
+
 The "DiffPy-CMI" is distributed subject to the following license conditions:
 
 .. code-block:: text