Update .gitattributes (#30934)
Update .gitattributes (#30934)

This requires git >= 2.10 but it was released almost 4 years ago.
twbs/bootstrap,m5o/bootstrap,coliff/bootstrap,coliff/bootstrap,tjkohli/bootstrap,inway/bootstrap,twbs/bootstrap,tjkohli/bootstrap,GerHobbelt/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,m5o/bootstrap