[ixpmanager] Upgrade 5.2.0

[Barry O'Donovan]

Shahab Vahabzadeh wrote on 23/03/2020 20:02:
> Barry,
> You mean following these steps for all versions?
> 
> https://docs.ixpmanager.org/install/upgrading/

Yes. But more specifically, follow the release notes for each version:

https://github.com/inex/IXP-Manager/releases/tag/v5.3.0
https://github.com/inex/IXP-Manager/releases/tag/v5.4.0
https://github.com/inex/IXP-Manager/releases/tag/v5.5.0

As well as the upgrade instructions you referenced, some releases have 
additional steps.

  - Barry