fixed type

lib/tasks/travis.rake

 task :travis do
-  ["rspec spec", "rake cuucmber"].each do |cmd|
+  ["rspec spec", "rake cucumber"].each do |cmd|
     puts "Starting to run #{cmd}..."
     system("export DISPLAY=:99.0 && bundle exec #{cmd}")
     raise "#{cmd} failed!" unless $?.exitstatus == 0