Upgrade from 3.2.5 to 3.2.6.

<ChangeLog>

Upgrade urgency MODERATE: GEORADIUS, BITFIELD and Redis Cluster minor fixes.

This release mainly fixes three bugs:

1. A bug with BITFIELD that may cause the bitmap corruption when setting offsets larger than the current string size.

2. A GEORADIUS bug that may happen when using very large radius lengths, in the range of 10000km or alike, due to wrong bounding box calculation.

3. A bug with Redis Cluster which crashes when reading a nodes configuration file with zero bytes at the end, which sometimes happens with certain ext4 configurations after a system crash.

</ChangeLog>