Update changelog

Author: Demivan

CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to the "fluent-vue" extension will be documented in this fil
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
-## [Unreleased]
+### 1.0.0
 
-- Initial release
+Initial release of fluent-vue.
+Support syntax highlighting in `.ftl` files and in Vue `<fluent>` blocks.