Bug#903076: brutespray FTBFS: update Build-Depends: ruby-ronn -> ronn

[Helmut Grohne]

Source: brutespray
Version: 1.6.0-1
Severity: serious

Since ronn got split out of ruby-ronn, brutespray 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 brutespray uses the
command line tool.

Helmut