only make elm/src/*.{elm,js}
only make elm/src/*.{elm,js}

previously it would find elm-stuff/ and make harry blow up

Signed-off-by: Gabriel Dumitrescu <ac98dc248ba95b80e235d49d71a9a50afc4ea93d@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse