adds enviroment as a dependency for db:dev_seed task

lib/tasks/db.rake

@@ -1,6 +1,6 @@
 namespace :db do
   desc "Resets the database and loads it from db/dev_seeds.rb"
-  task :dev_seed do
+  task dev_seed: :environment do
     load(Rails.root.join("db", "dev_seeds.rb"))
   end
 end