Use modern RSpec option

See rspec/rspec-core#2845

Author: pirj

spec/support/configs/rspec.rb

@@ -4,9 +4,7 @@
 require 'aruba/api'
 
 RSpec.configure do |config|
-  config.filter_run focus: true
-
-  config.run_all_when_everything_filtered = true
+  config.filter_run_when_matching :focus
 
   config.example_status_persistence_file_path = 'tmp/rspec-examples.txt'
   config.profile_examples = 10