update headers' copyright notice

Author: Enchufa2

inst/include/Rcpp/String.h

@@ -3,6 +3,7 @@
 // String.h: Rcpp R/C++ interface class library -- single string
 //
 // Copyright (C) 2012 - 2018  Dirk Eddelbuettel and Romain Francois
+// Copyright (C) 2021  Iñaki Ucar
 //
 // This file is part of Rcpp.
 //

inst/include/Rcpp/routines.h

@@ -2,6 +2,7 @@
 //
 // Copyright (C) 2013  Romain Francois
 // Copyright (C) 2015  Dirk Eddelbuettel
+// Copyright (C) 2021  Iñaki Ucar
 //
 // This file is part of Rcpp.
 //

inst/include/Rcpp/storage/PreserveStorage.h

@@ -1,3 +1,25 @@
+// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
+//
+// String.h: Rcpp R/C++ interface class library -- single string
+//
+// Copyright (C) 2013  Romain Francois
+// Copyright (C) 2021  Iñaki Ucar
+//
+// This file is part of Rcpp.
+//
+// Rcpp is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 2 of the License, or
+// (at your option) any later version.
+//
+// Rcpp is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Rcpp.  If not, see <http://www.gnu.org/licenses/>.
+
 #ifndef Rcpp_PreserveStorage_h
 #define Rcpp_PreserveStorage_h
 

inst/include/Rcpp/traits/named_object.h

@@ -4,6 +4,7 @@
 // named_object.h: Rcpp R/C++ interface class library -- named SEXP
 //
 // Copyright (C) 2010 - 2017  Dirk Eddelbuettel and Romain Francois
+// Copyright (C) 2021  Iñaki Ucar
 //
 // This file is part of Rcpp.
 //

inst/include/RcppCommon.h

@@ -4,6 +4,7 @@
 //
 // Copyright (C) 2008 - 2009  Dirk Eddelbuettel
 // Copyright (C) 2009 - 2017  Dirk Eddelbuettel and Romain Francois
+// Copyright (C) 2021  Iñaki Ucar
 //
 // This file is part of Rcpp.
 //

src/barrier.cpp

@@ -1,6 +1,7 @@
 // barrier.cpp: Rcpp R/C++ interface class library -- write barrier
 //
 // Copyright (C) 2010 - 2020  Dirk Eddelbuettel and Romain Francois
+// Copyright (C) 2021  Iñaki Ucar
 //
 // This file is part of Rcpp.
 //