Add changelog and first entry

CHANGELOG.md

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+# Changelog
+
+## v0.6.3
+> 02 Nov 2021
+
+- Add all amqp.Publishing options to internal PublishOptions
+- Add notify on return channel for publisher
+- Add queue args to ConsumeOptions
+- Switch from streadway/amqp to official rabbitmq/amqp091-go
+- Allow consumer handler functions to Ack, NackDiscard, NackRequeue
+- Add option to skip exchange declaration for consumer