Update release notes for 0.3.8

10 jobs for master in 43 minutes and 5 seconds (queued for 1 second)
Name Stage Failure
failed
fedora-test Test
Tick: 2012
[1559021456389] INFO: Global environment: clearing connection cache.
[==========] 28 tests from 11 test cases ran. (312476 ms total)
[ PASSED ] 27 tests.
[ FAILED ] 1 test, listed below:
[ FAILED ] Replication.EnsureEntriesBeingReplicatedAreNotTrimmed

1 FAILED TEST
ERROR: Job failed: exit code 1