[collectd] Changing collectd's main branch.

[Matthias Runge]

On 03/07/2020 14:13, Florian Forster wrote:
> Hi all,
> 
> I have updated all pull requests to use "main" as their base branch
> instead of "master", i.e. the branch they target for merging into. Pull
> requests with other base branches were not modified.
> 
> Best regards,
> —octo

Thank you, that's good to know. Also thank you for taking the initiative
here.

Matthias