Redmine

Hi there,

I just upgraded my redmine instance successfully to latest version 5.0.0. Everything ran more or less smoothly, and my site is up and running again.
However now I realized, that existing issues that make use of the `thumbnail` macro in their description do no display the thumbnails any more.

Update: I could solve this by my own.

For the records:

In `config.configuration.yml`, add

imagemagick_convert_command: C:\your\path\to\ImageMagick-6.9.12-Q16-HDRI\convert.exe

and you are fine.