Update changelog

Author: XSAM

CHANGELOG.md

@@ -8,6 +8,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Added
+
+- Add instrumentation for Kafka (github.com/Shopify/sarama). (#134)
+- Add links and status message for mock span. (#134)
+
 ## [0.8.0] - 2020-07-10
 
 This release upgrades its [go.opentelemetry.io/otel](https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.8.0) dependency to v0.8.0, includes minor fixes, and new instrumentation.