Update copyright years

doc/doxygen/refman.tex

@@ -37,11 +37,11 @@ Generated by Doxygen.
 This manual documents the usage of StarPU version \STARPUVERSION. Its contents
 was last updated on \STARPUUPDATED.\\
 
-Copyright © 2009–2018 Université de Bordeaux
+Copyright © 2009–2019 Université de Bordeaux
 
-Copyright © 2010-2018 CNRS
+Copyright © 2010-2019 CNRS
 
-Copyright © 2011-2018 Inria
+Copyright © 2011-2019 Inria
 
 \medskip
 

doc/doxygen_dev/refman.tex

@@ -34,11 +34,11 @@ Generated by Doxygen.
 This manual documents the internal usage of StarPU version \STARPUVERSION. Its contents
 was last updated on \STARPUUPDATED.\\
 
-Copyright © 2009–2018 Université de Bordeaux
+Copyright © 2009–2019 Université de Bordeaux
 
-Copyright © 2010-2018 CNRS
+Copyright © 2010-2019 CNRS
 
-Copyright © 2011-2018 Inria
+Copyright © 2011-2019 Inria
 
 \medskip