Fix: return correct format in make_pretty_results.
Fix: return correct format in make_pretty_results.

osmium-org/osmium,wffurr/osmium,copyliu/osmium,copyliu/osmium,wffurr/osmium,copyliu/osmium,wffurr/osmium,wffurr/osmium,osmium-org/osmium,osmium-org/osmium,osmium-org/osmium