Update gemfile to stick with 3.1 for now
Update gemfile to stick with 3.1 for now

praktijkindex/ransack,guilleva/ransack,Mario245/ransack,vaski/ransack,avit/ransack,Eric-Guo/ransack,spectator/ransack,martndemus/ransack,laserlemon/ransack,ares/ransack,roman-franko/ransack,nagyt234/ransack,AndrewSwerlick/ransack,outstand/ransack,johan--/ransack,activerecord-hackery/ransack,mariorcardoso/ransack,reinteractive/ransack,amboxer21/ransack,0xCCD/ransack