Add update message for 2.0.0

Author: FichteFoll

messages.json

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+{
+    "2.0.0": "messages/2.0.0.md"
+}

messages/2.0.0.md

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+v2.0.0 - 2025-05-11
+-------------------
+
+The package has been adopted by the SublimeText GitHub org and now lives at
+<https://github.com/SublimeText/Terraform/> for the community to maintain.
+This is accompanied by many changes
+to bring the syntax definition up to current standards,
+courtesy of @deathaxe, @FichteFoll, and @michaelblyons.
+
+In summary, the syntax has been aligned with current standards
+as they have developed over time for the default syntaxes
+and various other third-party syntaxes.
+For a detailed list of changes,
+please refer to the full changelog at
+<https://github.com/SublimeText/Terraform/blob/master/CHANGELOG.md>.
+
+Note that this release is only compatible with ST builds 4180 and higher.
+The old version is still available for installation on older builds
+but is not maintained anymore.