style(rubocop): fix all safe auto correctable offenses

config/initializers/sentry.rb

@@ -1,14 +1,14 @@
-require 'postal/config'
+require "postal/config"
 
 if Postal.config.general&.exception_url
-  require 'raven'
+  require "raven"
   Raven.configure do |config|
     config.dsn = Postal.config.general.exception_url
-    config.environments = ['production']
-    if ENV['DEV_EXCEPTIONS']
-      config.environments << 'development'
+    config.environments = ["production"]
+    if ENV["DEV_EXCEPTIONS"]
+      config.environments << "development"
     end
     config.silence_ready = true
-    config.tags = {:process => ENV['PROC_NAME']}
+    config.tags = { process: ENV.fetch("PROC_NAME", nil) }
   end
 end