2.0.0-beta.1

• Change Produce and ProduceAsync to receive the message key as an object (#159)
• Added ConfluentJsonSerializer and ConfluentProtobufSerializer (#140)

Breaking changes

• Change the serializers to use async and streams (#158)
• Refactor the IMessageContext to a more concise structure (#152)
• Normalize serializers classes, project and packages name (#146)