changelog for pipe completion improvements

Author: zth

CHANGELOG.md

@@ -18,6 +18,8 @@
 - Rename custom LSP methods names. https://github.com/rescript-lang/rescript-vscode/pull/611
 - Better performance for Inlay Hints and Codelens. https://github.com/rescript-lang/rescript-vscode/pull/634
 - Accept both `@ns.doc` and the new `@res.doc` for the internal representation of doc comments. And both `@ns.optional` and `@res.optional` for the optional fields. https://github.com/rescript-lang/rescript-vscode/pull/642
+- Make pipe completion work more reliably after function calls. https://github.com/rescript-lang/rescript-vscode/pull/656
+- Make pipe completion work in pipe chains, not just on the first pipe. https://github.com/rescript-lang/rescript-vscode/pull/656
 
 #### :bug: Bug Fix