Change 'FactoryGirl' references to 'FactoryBot'

[JamesFrost]

After using the Rails Composer tool to generate a starter app, the rails server command exits with the following error:

$ rails server
=> Booting Puma
=> Rails 5.1.4 application starting in development 
=> Run `rails server -h` for more startup options
Exiting
/Users/jamesfrost/example-app/spec/factories/users.rb:1:in `<top (required)>': uninitialized constant FactoryGirl (NameError)
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot-4.8.2/lib/factory_bot/find_definitions.rb:20:in `block (2 levels) in find_definitions'
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot-4.8.2/lib/factory_bot/find_definitions.rb:19:in `each'
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot-4.8.2/lib/factory_bot/find_definitions.rb:19:in `block in find_definitions'
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot-4.8.2/lib/factory_bot/find_definitions.rb:15:in `each'
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot-4.8.2/lib/factory_bot/find_definitions.rb:15:in `find_definitions'
	from /Library/Ruby/Gems/2.3.0/gems/factory_bot_rails-4.8.2/lib/factory_bot_rails/railtie.rb:21:in `block in <class:Railtie>'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:67:in `block in execute_hook'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `each'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/application/finisher.rb:73:in `block in <module:Finisher>'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in `instance_exec'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:59:in `block in run_initializers'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:347:in `each'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:347:in `call'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:58:in `run_initializers'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/application.rb:353:in `initialize!'
	from /Users/jamesfrost/example-app/config/environment.rb:5:in `<top (required)>'
	from config.ru:3:in `require_relative'
	from config.ru:3:in `block in <main>'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:55:in `instance_eval'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:55:in `initialize'
	from config.ru:in `new'
	from config.ru:in `<main>'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:49:in `eval'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:49:in `new_from_string'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:40:in `parse_file'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/server.rb:319:in `build_app_and_options_from_config'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/server.rb:219:in `app'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:24:in `app'
	from /Library/Ruby/Gems/2.3.0/gems/rack-2.0.3/lib/rack/server.rb:354:in `wrapped_app'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:80:in `log_to_stdout'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:42:in `start'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:135:in `block in perform'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `tap'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `perform'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
	from /Users/jamesfrost/example-app/bin/rails:9:in `require'
	from /Users/jamesfrost/example-app/bin/rails:9:in `<top (required)>'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
	from /Library/Ruby/Gems/2.3.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
	from /Users/jamesfrost/example-app/bin/spring:15:in `<top (required)>'
	from bin/rails:3:in `load'
	from bin/rails:3:in `<main>'

The FactoryGirl project has recently changed its name to FactoryBot; after replacing all references to FactoryGirl with FactoryBot, the server runs.