Tweak Stack Overflow support info
Tweak Stack Overflow support info

Via the stylelint Gitter room: `I didn’t thoroughly understand what stackoverflow is our preferred QA forum meant.`
• https://gitter.im/stylelint/stylelint?at=576d7b4f165412787f1ac447
stylelint/stylelint,hudochenkov/stylelint,heatwaveo8/stylelint,stylelint/stylelint,stylelint/stylelint,heatwaveo8/stylelint,gucong3000/stylelint,gaidarenko/stylelint,gucong3000/stylelint,hudochenkov/stylelint,gaidarenko/stylelint,stylelint/stylelint,heatwaveo8/stylelint,gucong3000/stylelint,gaidarenko/stylelint,hudochenkov/stylelint