Flow bugfix releases: 4.3.20, 5.0.19, 5.1.13, 5.2.9, 5.3.5 & 6.0.1

[kdambekalns (Karsten Dambekalns)]

I tagged bugfix releases for Flow yesterday. They fix some small but annoying issues:

• an issue with reflection of properties annotated like @var int|null (|null being the problem)
• cache:setup being broken for the PdoBackend
• an issue with getScriptRequestPath on Windows servers
• resource:clean will now remove broken resources from the right collection

The released versions are:

• Flow - 4.3.20 ChangeLog
• Flow - 5.0.19 ChangeLog
• Flow - 5.1.13 ChangeLog
• Flow - 5.2.9 ChangeLog
• Flow - 5.3.5 ChangeLog
• Flow - 6.0.1ChangeLog

Thanks to those who contributed!