update author/copyright information

pocketfft_hdronly.h

@@ -2,7 +2,13 @@
 This file is part of pocketfft.
 
 Copyright (C) 2010-2019 Max-Planck-Society
-Author: Martin Reinecke
+Copyright (C) 2019 Peter Bell
+
+For the odd-sized DCT-IV transforms:
+  Copyright (C) 2003, 2007-14 Matteo Frigo
+  Copyright (C) 2003, 2007-14 Massachusetts Institute of Technology
+
+Authors: Martin Reinecke, Peter Bell
 
 All rights reserved.
 

pypocketfft.cc

@@ -7,7 +7,9 @@
  *  Python interface.
  *
  *  Copyright (C) 2019 Max-Planck-Society
+ *  Copyright (C) 2019 Peter Bell
  *  \author Martin Reinecke
+ *  \author Peter Bell
  */
 
 #include <pybind11/pybind11.h>