Rakefile in warden-0.9.7 vs Rakefile in warden-0.10.0

@@ -26,7 +26,7 @@
 task :default => :spec
 
 desc "Run specs"
 Spec::Rake::SpecTask.new do |t|
   t.spec_files = FileList['spec/**/*_spec.rb']
-  t.spec_opts = %w(-fs --color)
+  t.spec_opts = %w(-fs --color --backtrace)
 end