Add CHANGES.md as release note.
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+1. Hessian-lite serialization: revert locale serialization for compatibility, #1413
+2. Asset transfer to ASF, includeing pom, license, DISCLAIMER and so on, #1491
+3. Introduce of new dispatcher policy: EagerThreadpool, #1568
+4. Separate monitor data with group and version, #1407
+5. Spring Boot Enhancenment, #1611
+6. Gaceful shutdown enhancement
+   - Remove exporter destroy logic in AnnotationBean.
+   - Waiting for registry notification on consumer side by checking channel state.
+7. Simplify consumer/provider side check in RpcContext, #1444.
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