update copyright year to 2021 in docs

basnijholt · web-flow · commit a94ecd056ca1 · 2021-09-24T00:27:45.000+02:00
diff --git a/docs/source/conf.py b/docs/source/conf.py
@@ -31,7 +31,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "adaptive"
-copyright = "2018-2019, Adaptive Authors"
+copyright = "2018-2021, Adaptive Authors"
 author = "Adaptive Authors"
 
 # The short X.Y version
