upgrade Confluent.Kafka to 1.4.3

Fix rabbitmq connection may be reused when close forced. dotnetcore#533

Fix diagnostics event error. dotnetcore#504

Try to fix azure service bus header cast exception. dotnetcore#483

Add file copyright

change DashboardMiddleware to async (dotnetcore#390)

Add service name to RabbitMQ connection alias name

Use ReadOnlySpan<char> Improve performance after .netcoreapp2.1 (dotn…

…etcore#192)

Fixed emoji storage failure (dotnetcore#305)

Update README.md (dotnetcore#150)