V1.7.0 checklist

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• review Async in method names; consider removing in line with modern APIs minimal example #47
• probably remove validateBrokerUri as its no longer an integral part of the API as of 1.4 in 1.5
• prune less frequently used arguments in Create calls in 1.5.6
• Complete Add header support for BatchedProducer #86 @deviousasti
• remove FsKafka0 eed9940
• remove net461 multi-targeting
• remove

  FsKafka/src/FsKafka/FsKafka.fs

  Line 222 in f439153

  member this.AwaitThreshold(ct : CancellationToken, consumer : IConsumer<_,_>) =

• target CK 1.7.0

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@deviousasti As discussed in #86, we should do the right thing for FsKafka0 now. This would also enable Propulsion 2.11.0 (which should more correctly be named 3.0.0 based on the work list in jet/propulsion#116)