Run code formatter as part of test suite

Changes.md

@@ -23,6 +23,8 @@ This release has major breaking changes.  Read and test carefully in production.
   arguments to Sidekiq. Use a proper process supervisor (e.g. systemd or
   foreman) to manage Sidekiq.  See the Deployment wiki page for links to
   more resources.
+- Integrate the StandardRB code formatter to ensure consistent code
+  styling. [#4114, gearnode]
 
 HEAD
 ---------

Rakefile

@@ -7,4 +7,4 @@ Rake::TestTask.new(:test) do |test|
   test.pattern = "test/**/test_*.rb"
 end
 
-task default: :test
+task default: [:standard, :test]