Update ISSUE_TEMPLATE with Bootstrap format
Update ISSUE_TEMPLATE with Bootstrap format

Took the basic structure from Bootstrap since they have a large project
that gets a lot of issues
[skip CI]

Smartbank/node-sass,Smartbank/node-sass,xzyfer/node-sass,nschonni/node-sass,paulcbetts/node-sass,nschonni/node-sass,xzyfer/node-sass,xzyfer/node-sass,saper/node-sass,saper/node-sass,Smartbank/node-sass,sass/node-sass,sass/node-sass,Smartbank/node-sass,sass/node-sass,xzyfer/node-sass,sass/node-sass,nschonni/node-sass,saper/node-sass,paulcbetts/node-sass,xzyfer/node-sass,nschonni/node-sass,sass/node-sass,nschonni/node-sass,sass/node-sass,saper/node-sass,nschonni/node-sass,Smartbank/node-sass,paulcbetts/node-sass,xzyfer/node-sass,Smartbank/node-sass,nschonni/node-sass,sass/node-sass,saper/node-sass,saper/node-sass,paulcbetts/node-sass,saper/node-sass,Smartbank/node-sass,xzyfer/node-sass