[nats-streaming] Update to v0.3.0

Details can be found [here](https://github.com/nats-io/nats-streaming-server/releases/tag/v0.3.0)

library/nats-streaming

@@ -1,6 +1,6 @@
 Maintainers: Ivan Kozlovic <[email protected]> (@kozlovic)
 
-Tags: 0.2.2, latest
+Tags: 0.3.0, latest
 GitRepo: https://github.com/nats-io/nats-streaming-docker.git
-GitCommit: d7e21255fec8967f7dbdacdb4501c8e78d821e49
+GitCommit: 1fcbfd456264c5da5888e279d9ea865166eeb3cf