Improve Contributing Guide [skip ci]
Improve Contributing Guide [skip ci]

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