Updated readme [skip ci]

Author: ankane

README.md

@@ -215,6 +215,10 @@ let indices = vec.indices
 let values = vec.values
 ```
 
+## History
+
+View the [changelog](https://github.com/pgvector/pgvector-swift/blob/master/CHANGELOG.md)
+
 ## Contributing
 
 Everyone is encouraged to help improve this project. Here are a few ways you can help: