Release notes for Gerrit 2.10.4

This is a fix for >10x performance degradation, caused by this JGit
change: [1].

In addidtion some minor fixes for base64 patch download and OAuth2
extension point are also included.

[1] https://git.eclipse.org/r/31081

Change-Id: Ia9e190b22e1573a3876db2a87198fca9dd7ea01f
2 files changed