fix typo in base_spec
fix typo in base_spec

Fixes #301

amboxer21/ransack,vaski/ransack,Mario245/ransack,nagyt234/ransack,reinteractive/ransack,Eric-Guo/ransack,mariorcardoso/ransack,outstand/ransack,AndrewSwerlick/ransack,avit/ransack,praktijkindex/ransack,laserlemon/ransack,roman-franko/ransack,activerecord-hackery/ransack,martndemus/ransack,guilleva/ransack,johan--/ransack