Run standard on CI

To ensure we run standard before merging any PR, this commit adds
standard to Travis CI

.travis.yml

@@ -12,6 +12,7 @@ branches:
     - master
 install:
   - "bundle install --retry 3 --jobs 8"
+script: "bundle exec rake"
 gemfile:
   - gemfiles/rails5.0.gemfile
   - gemfiles/rails5.1.gemfile

Rakefile

@@ -1,6 +1,7 @@
 require "bundler/setup"
 require "cucumber/rake/task"
 require "rspec/core/rake_task"
+require "standard/rake"
 
 Bundler::GemHelper.install_tasks name: "factory_bot_rails"
 
@@ -11,5 +12,5 @@ end
 
 RSpec::Core::RakeTask.new(:spec)
 
-desc "Run the test suite"
-task default: %w[spec cucumber]
+desc "Run the test suite and standard"
+task default: %w[spec cucumber standard]