Add GTmetrix (#360)
Add GTmetrix (#360)


jdm-contrib/justdelete.me,tupaschoal/justdelete.me,tupaschoal/justdelete.me,jdm-contrib/justdelete.me,jdm-contrib/justdelete.me,jdm-contrib/justdelete.me,tupaschoal/justdelete.me,tupaschoal/justdelete.me