Typos in Tasks

[gaand]

https://github.com/ga-wdi-boston/ruby-template#tasks

 Developers should run these often!

--   `bin/rake nag`  (or `bundle exec rake test`):
+-   `bin/rake nag`  (or `bundle exec rake nag`):
     runs code quality analysis tools on your code and complains.
--   `bin/rake test` (or `bundle exec rake test`): runs automated tests
+-   `bin/rake test` (or `bundle exec rake test`): runs automated tests.