Update README.md (#199)

* update changelog to 4.0.0 Co-authored-by: Keith Roberts <[email protected]>
CHLNDDEV · Mar 14, 2021 · eed66e5 · eed66e5
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@@ -141,7 +141,9 @@ Changelog
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Unreleased
+- None
 
+### [4.0.0] - 2021-03-14
 ## Added
 - `mesh2d` interface improvements to filter small polygons.
 - Support for creation of `fort.20` files for forcing rivers by @Jiangchao3