Add changelog

Author: DZakh

Diff for: CHANGELOG.md

@@ -22,6 +22,8 @@
 - Handle completion for DOM/element attributes and attribute values properly when using a generic JSX transform. https://github.com/rescript-lang/rescript-vscode/pull/919
 - Highlight tagged template literal functions as functions. https://github.com/rescript-lang/rescript-vscode/pull/920
 - Complete for `type t` values when encountering a `type t` in relevant scenarios. https://github.com/rescript-lang/rescript-vscode/pull/924
+- Highlight escaped sequences as a whole and not only the first character. https://github.com/rescript-lang/rescript-vscode/pull/929
+- Start highlighting escaped sequences in template literals. https://github.com/rescript-lang/rescript-vscode/pull/929
 
 ## 1.38.0