Document release cycle in CONTRIBUTING.md
Document release cycle in CONTRIBUTING.md

mikkeloscar/sway,ascent12/sway,mikkeloscar/sway,SirCmpwn/sway,ascent12/sway,ptMuta/sway,1ace/sway,4e554c4c/sway,4e554c4c/sway,1ace/sway,ascent12/sway,johalun/sway,sleep-walker/sway,taiyu-len/sway,sleep-walker/sway,taiyu-len/sway,taiyu-len/sway,1ace/sway