chore: insiders changelog

Author: johnsoncodehk

CHANGELOG_INSIDERS.md

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+# Changelog (Insiders)
+
+## [v2.1.0-insiders.1](https://github.com/volarjs/insiders/releases/tag/v2.1.0-insiders.1)
+
+### New Features
+
+#### Reactions visualization (PR: https://github.com/volarjs/insiders/pull/5)
+
+![](https://github.com/volarjs/insiders/assets/16279759/45ee9090-3b16-4d20-99a5-08b5a0fd3c50)
+
+#### Template interpolation decorators (PR: https://github.com/volarjs/insiders/pull/4)
+
+> To disable this feature, uncheck `vue.editor.templateInterpolationDecorators` in VSCode settings.
+
+![](https://github.com/volarjs/insiders/assets/16279759/27a36203-7170-47ce-9fe2-323cf18f1f3b)
+
+### Other Changes
+
+- Merged https://github.com/vuejs/language-tools/commit/1b9946c02ee3f5bb8c2de17c430985756115e51c into Insider.