Fix RSpec/Output cop violations in spec files

Author: Naragod

spec/models/grouping_spec.rb

@@ -131,7 +131,6 @@
         end
         grouping1 = groupings.select { |grouping| grouping.tas.first == tas.first }
         grouping2 = groupings.select { |grouping| grouping.tas.first == tas.last }
-        print(grouping2.length, grouping1.length)
         expect(grouping1.length > grouping2.length).to be(true)
       end
 

spec/spec_helper.rb

@@ -37,7 +37,7 @@
 begin
   ActiveRecord::Migration.maintain_test_schema!
 rescue ActiveRecord::PendingMigrationError => e
-  puts e.to_s.strip
+  warn e.to_s.strip
   exit 1
 end