Make ready for release 4.3.1

Make ready for release 4.3.1

Update CHANGELOG.md

Updated NuGet package, changelog, and make ready for release 4.3.0

Make ready for release 4.2.4

Update CHANGELOG.md

Update CHANGELOG.md

The consumer no longer sends the schema to the broker when the schema…

… type is 'None'.

Make ready for release 4.2.2

Make ready for release 4.2.1

The producer shouldn't send the schema to the broker when the schema …

…type is 'None'.