Add a script to upgrade vendor/re
Add a script to upgrade vendor/re

dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,rdavison/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,rdavison/jbuilder