~/projects/bkz $ ruby bkz.rb --title "betting on theories"
Warning: Goodreads data missing.
/Users/robb/projects/bkz/amazon.rb:22:in `getratings': undefined method `[]' for nil:NilClass (NoMethodError)
from /Users/robb/projects/bkz/amazon.rb:35:in `amazon_search'
from bkz.rb:64:in `add'
from bkz.rb:86:in `<main>'