remove deprecated factory_girl_rails gem

since it is deprecated and not used anywhere
if factories become a need again, one can use factory_bot_rails

.travis.yml

@@ -7,15 +7,14 @@ script: "bundle exec rake"
 rvm:
   - 2.3
   - 2.4
-  - 2.5
   - 2.6
 
 env:
   - DB=sqlite
 
 before_script:
   - gem update --system
-  - gem install bundler --version 1.17.3
+  - gem install bundler:1.17.3
   - bundle install
   - bundle exec rake app:db:setup
 

i18n_rails_helpers.gemspec

@@ -23,5 +23,4 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'rspec-rails'
   s.add_development_dependency 'capybara'
-  s.add_development_dependency 'factory_girl_rails'
 end

spec/rails_helper.rb

@@ -4,7 +4,6 @@
 
 require File.expand_path('../dummy/config/environment.rb',  __FILE__)
 require 'rspec/rails'
-require 'factory_girl_rails'
 
 Rails.backtrace_cleaner.remove_silencers!