Update copyright year / version

Note: should probably import version number / current year...

doc/conf.py

@@ -65,18 +65,18 @@
 
 # General information about the project.
 project = u'AMUSE'
-copyright = u'2009-2019 The AMUSE Team'
+copyright = u'2009-2020 The AMUSE Team'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
 #version = 'dev'
-version = '12.0'
+version = '13.0'
 # The full version, including alpha/beta/rc tags.
 #release = 'latest'
-release = '12.0'
+release = '13.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.