Update CHANGELOG.md

CHANGELOG.md

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 ## 8.0.0
-* // Update changelog here
+New major release of Qonversion Android SDK with the new Google Play Billing features support!
+* added base plans and offers support;
+* Gradle on Android was upgraded to the version 8;
+* the `checkTrialIntroEligibility` method improved and now detects the eligibility based on store details on Android;
+* the `QProductDuration` and `QTrialDuration` classes were removed;
+* the `QProrationMode` enum was removed and replaced with `QPurchaseUpdatePolicy`.
+
+For the complete release notes with the migration guide please see [the documentation](https://documentation.qonversion.io/docs/unity-7-migration-guide).
 
 ## 7.3.2
 * Fixed restore issue for iOS