Add line breaks to error logs

Ref: jenseng#36

Co-authored-by: Alex Ghiculescu <[email protected]>

lib/immigrant/task.rb

@@ -4,16 +4,20 @@
     Rails.application.eager_load!
 
     keys, warnings = Immigrant::KeyFinder.new.infer_keys
+
+    $stderr.puts if warnings.values.any?
     warnings.values.each { |warning| $stderr.puts "WARNING: #{warning}" }
 
+    $stderr.puts if keys.any?
     keys.each do |key|
       column = key.options[:column]
       pk = key.options[:primary_key]
       $stderr.puts "Missing foreign key relationship on '#{key.from_table}.#{column}' to '#{key.to_table}.#{pk}'"
     end
 
     if keys.any?
-      puts 'Found missing foreign keys, run `rails generate immigration MigrationName` to create a migration to add them.'
+      $stderr.puts
+      $stderr.puts 'Found missing foreign keys, run `rails generate immigration MigrationName` to create a migration to add them.'
       exit keys.count
     end
   end