it's be nice

libjohn · libjohn · commit 7a78bc4a857a · 2021-06-14T12:21:40.000-04:00
diff --git a/.binder/runtime.txt b/.binder/runtime.txt
@@ -1 +1 @@
-r-3.6-2019-04-12
+r-4.0-2020-11-12
