minor whitespace change

Trying to get travis-ci build to pass for "git diff --exit-code" command

contrib/kube-prometheus/build.sh

@@ -13,3 +13,4 @@ mkdir manifests
 
                                                # optional, but we would like to generate yaml, not json
 jsonnet -J vendor -m manifests "${1-example.jsonnet}" | xargs -I{} sh -c 'cat {} | gojsontoyaml > {}.yaml; rm -f {}' -- {}
+