Update Changelog.md

ansgarm · ansgarm · commit f68c58fb4d7c · 2024-08-22T11:01:00.000+02:00
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 # HCL Changelog
 
+## v2.22.0 (Unreleased)
+
+### Enhancements
+
+* feat: return an ExprSyntaxError for invalid references that end in a dot ([#692](https://github.com/hashicorp/hcl/pull/692))
+
 ## v2.21.0 (June 19, 2024)
 
 ### Enhancements
