doc: update copyright date

bgilbert · bgilbert · commit 4ccf3aef8545 · 2022-05-22T02:04:46.000-04:00
diff --git a/doc/conf.py b/doc/conf.py
@@ -46,7 +46,7 @@
 
 # General information about the project.
 project = 'OpenSlide Python'
-copyright = '2010-2016 Carnegie Mellon University and others'
+copyright = '2010-2022 Carnegie Mellon University and others'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
