update binstub to find spring as a subdependency
update binstub to find spring as a subdependency

if you only add say spring-commands-rspec to your Gemfile, that will
automatically pull in the latest version of spring, but as a
sub-dependency, so there will be an extra line of indentation in the
lockfile

rails/spring,mariusbutuc/spring,ypresto/spring,smathy/spring,maclover7/spring,universsky/spring-1,y-yagi/spring,slobodankovacevic/spring,grosser/spring