Upgrade from 4.0-rc1 to 4.0-rc2.
<ChangeLog>
Upgrade urgency LOW: This release mainly fixes a rare GEO API bug and a crash
related to the modules subsystem.
Redis 4.0.0-RC2 (version number 3.9.102) just fixes two bugs:
- GEORADIUS could fail reporting items with very big radius lengths because of a bug in the bounding box computation function. This was fixed and tests with large radius sizes were added.
- There was a crash in the modules subsystem that was not merged into RC1 for an error, while it was already fixed into the "unstable" branch.
</ChangeLog>