[Debian-med-packaging] Bug#903069: qiime FTBFS: update Build-Depends: ruby-ronn -> ronn

[Helmut Grohne]

Source: qiime
Version: 1.9.1+dfsg-2
Severity: serious

Since ronn got split out of ruby-ronn, qiime fails to build from source.
It was not possible to have ruby-ronn temporarily depend on ronn,
because that would have created a dependency cycle. Please update
Build-Depends and replace ruby-ronn with ronn as qiime uses the command
line tool.

Helmut