Update Aruba gem

The `run_simple` method has been replaced by `run_command_and_stop` since v0.14.8. See: https://github.com/cucumber/aruba/blob/e069bacedaea8cad4a98c46ddae1bc054a3de48e/CHANGELOG.md?plain=1#L414

Author: jdudley1123

features/step_definitions/terrafile_steps.rb

@@ -12,7 +12,7 @@
 end
 
 When('I run the _terrafile_ command') do
-  run_simple('terrafile', fail_on_error: false)
+  run_command_and_stop('terrafile', fail_on_error: false)
 end
 
 Then('I should see that a _modules_ directory will be created') do

terrafile.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.executables   = ['terrafile']
 
-  spec.add_development_dependency 'aruba',      '~> 0.14'
+  spec.add_development_dependency 'aruba',      '~> 2.2'
   spec.add_development_dependency 'bundler',    '>= 2.1.0'
   spec.add_development_dependency 'pry-byebug', '~> 3.6'
   spec.add_development_dependency 'rake',       '~> 13.0'