Update CHANGELOG.md

Author: garyb

CHANGELOG.md

@@ -7,13 +7,17 @@ Notable changes to this project are documented in this file. The format is based
 Breaking changes:
 
 New features:
-- Added an `edges` function that returns a list of all edges in the graph (#17 by @MaybeJustJames)
-- Added `toMap` to unwrap `Graph` (#18)
 
 Bugfixes:
 
 Other improvements:
 
+## [v8.1.0](https://github.com/purescript/purescript-graphs/releases/tag/v8.1.0) - 2022-07-30
+
+New features:
+- Added an `edges` function that returns a list of all edges in the graph (#17 by @MaybeJustJames)
+- Added `toMap` to unwrap `Graph` (#18 by @notquiteamonad)
+
 ## [v8.0.0](https://github.com/purescript/purescript-graphs/releases/tag/v8.0.0) - 2022-04-27
 
 Breaking changes: