update copyright year in documentation

doc/conf.py.in

@@ -58,7 +58,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'ProMod3'
-copyright = u'2013-2020, SIB - Swiss Institute of Bioinformatics and Biozentrum - University of Basel'# pylint: disable=redefined-builtin
+copyright = u'2013-2021, SIB - Swiss Institute of Bioinformatics and Biozentrum - University of Basel'# pylint: disable=redefined-builtin
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the