1.0.3 Release notes (#795)

docs/src/main/paradox/release-notes/1.0.x.md

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 # Alpakka Kafka 1.0.x
 
+@@@ note
+In case you are browsing a specific version's documentation: check out the [latest release notes](https://doc.akka.io/docs/alpakka-kafka/current/release-notes/index.html)
+@@@
+
+# 1.0.3
+
+Released: 2019-05-09
+
+Alpakka Kafka 1.0.3 fixes an important bug in the transactional support and improves the testkit for Java users.
+
+## Most important changes since 1.0.2
+
+* Transactions: Avoid a timeout during draining @github[#787](#787) by [
+Szymon Matejczyk, @szymonm](https://github.com/szymonm)
+* Error handling: Signal exceptions from subscribe to stream, part of @github[#772](#772)
+* Testkit: Pull Embedded Kafka from new organisation id, part of @github[#772](#772)
+* Testkit: Improve Java API and make timeouts configurable via config @github[#786](#786)
+* Testkit: Specify the Docker image version for Testcontainers Kafka @github[#783](#783) as suggested by [@miguelpuyol](https://github.com/miguelpuyol) 
+
+The detailed list of changes is found in [the milestone](https://github.com/akka/alpakka-kafka/milestone/31?closed=1).
+
+### General information
+
+This release is compiled and tested against [Akka 2.5](https://doc.akka.io/docs/akka/current/) and Scala 2.11 and 2.12 on Adopt OpenJDK 1.8.
+
+This release was made possible by:
+
+| Author | Commits | Lines added | Lines removed |
+| ------ | ------- | ----------- | ------------- |
+| [<img width="20" alt="2m" src="https://avatars3.githubusercontent.com/u/422086?v=4&s=40"> **2m**](https://github.com/2m) | 17 | 957 | 517 |
+| [<img width="20" alt="szymonm" src="https://avatars2.githubusercontent.com/u/5087912?v=4&s=40"> **szymonm**](https://github.com/szymonm) | 2 | 29 | 17 |
+| [<img width="20" alt="ennru" src="https://avatars3.githubusercontent.com/u/458526?v=4&s=40"> **ennru**](https://github.com/ennru) | 2 | 15 | 6 |
+
+
 # 1.0.2
 
 Released: 2019-05-02