[skip ci] Another pass through the Contributing Guide
[skip ci] Another pass through the Contributing Guide

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