Changelog update

docs/unity/changelog.md

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 # Unity SDK Changelog
+## 2.0.0
+*September 30th, 2024*
+:::info Important
+This version of the Unity SDK contains several breaking changes to our API, including the removal of deprecated functions.
+
+Additionally, with the update to Embrace Android 6.13, the SDK now requires Gradle 7.5.1, AGP 7.4.2, and API 34 or higher.
+:::
+
+* Updated Embrace Android SDK to 6.13
+* Updated Embrace iOS SDK to 6.4
+* Removed deprecated functions in API
+* Changed StartSDK call to support new EmbraceStartupArgs type
+
 ## 1.26.1
 *August 12th, 2024*
 * NPE patch for null EmbraceSpanEvents