Add no-duplicate-selectors to integration test
Add no-duplicate-selectors to integration test

gucong3000/stylelint,evilebottnawi/stylelint,gaidarenko/stylelint,stylelint/stylelint,hudochenkov/stylelint,gucong3000/stylelint,heatwaveo8/stylelint,hudochenkov/stylelint,gaidarenko/stylelint,stylelint/stylelint,gaidarenko/stylelint,stylelint/stylelint,hudochenkov/stylelint,m-allanson/stylelint,stylelint/stylelint,gucong3000/stylelint,heatwaveo8/stylelint,heatwaveo8/stylelint,evilebottnawi/stylelint