Release notes in the Alpakka Kafka documentation

Notable changes since 2.0.5

The most relevant change in this release is the update of TestContainers to 1.15.1 (see below)

• Handle any combination of Committables in CommitObservationLogic #1262 by @seglo
• Fix message-batch loss when rebalancing partitioned sources #1263 by @jhooda
• Producer.committableSink: offsets not committed, when MultiMessage is empty #1200 by @herzrasen

Alpakka Kafka TestKit

• Update default CP version and make docker image/tag configurable #1287 by @seglo
• Testkit: Make Testcontainer logs visible #1281 by @seglo
• Testcontainers Kafka 1.15.1 (was 1.14.3) #1257 by @scala-steward
• TestKit: make consumerDefaults parameterless again #1292

Dependencies

• jackson-databind 2.10.5.1 (was 2.10.5) #1270 by @scala-steward
• Add note about provided jackson dependency #1245 by @seglo