fix require issues causing 'bin/rake ci' to fail

Author: thewoolleyman

spec/rails_helper.rb

@@ -7,6 +7,7 @@
 require "rspec/rails"
 require "capybara/rspec"
 require "capybara-screenshot/rspec"
+require "database_cleaner"
 
 # Add additional requires below this line. Rails is not loaded until this point!