cleanup contributing now that we have issue template - make same for v4 and v3
cleanup contributing now that we have issue template - make same for v4 and v3

wallter/bootstrap-material-design,rlugojr/bootstrap-material-design,rlugojr/bootstrap-material-design,rlugojr/bootstrap-material-design,wallter/bootstrap-material-design,wallter/bootstrap-material-design