- Update library v1.3.0 -> 1.5.0
 * Improved broker connection error reporting with more useful information and
   hints on the cause of the problem.
 * Consumer: Propagate errors when subscribing to unavailable topics (#1540)
 * Producer: Add `batch.size` producer configuration property (#638)
 * Add `topic.metadata.propagation.max.ms` to allow newly manually created
   topics to be propagated throughout the cluster before reporting them
   as non-existent. This fixes race issues where CreateTopics() is
   quickly followed by produce().
 * Prefer least idle connection for periodic metadata refreshes, et.al.,
   to allow truly idle connections to time out and to avoid load-balancer-killed
   idle connection errors (#2845)
 * Added `rd_kafka_event_debug_contexts()` to get the debug contexts for
   a debug log line (by @wolfchimneyrock).
 * Added Test scenarios which define the cluster configuration.
 * Added MinGW-w64 builds (@ed-alertedh, #2553)
 * `./configure --enable-XYZ` now requires the XYZ check to pass,
   and `--disable-XYZ` disables the feature altogether (@benesch)
 * Added `rd_kafka_produceva()` which takes an array of produce arguments
   for situations where the existing `rd_kafka_producev()` va-arg approach
   can't be used.
 * Added `rd_kafka_message_broker_id()` to see the broker that a message
   was produced or fetched from, or an error was associated with.
 * Added RTT/delay simulation to mock brokers.
 * Subscribing to non-existent and unauthorized topics will now propagate
   errors `RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART` and
   `RD_KAFKA_RESP_ERR_TOPIC_AUTHORIZATION_FAILED` to the application through
   the standard consumer error (the err field in the message object).
 * Consumer will no longer trigger auto creation of topics,
   `allow.auto.create.topics=true` may be used to re-enable the old deprecated

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