update years in license and README

Author: emilykl

LICENSE.txt

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016-2024 Plotly Technologies Inc.
+Copyright (c) 2016-2026 Plotly Technologies Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -130,7 +130,7 @@ on your command line.
 
 ## Copyright and Licenses
 
-Code and documentation copyright 2019 Plotly, Inc.
+Code and documentation copyright 2026 Plotly, Inc.
 
 Code released under the [MIT license](https://github.com/plotly/plotly.py/blob/main/LICENSE.txt).