try to freeze older database_cleaner version to please Travis
try to freeze older database_cleaner version to please Travis

abreckner/monologue,GapIntelligence/monologue,paresharma/monologue,munirent/monologue,caitlingoldman/monologue,GapIntelligence/monologue,bertomartin/monologue,bertomartin/monologue,tam-vo/monologue,kyle-annen/monologue,thiesa/monologue,abreckner/monologue,tam-vo/monologue,abreckner/monologue,bertomartin/monologue,jipiboily/monologue,paresharma/monologue,tam-vo/monologue,paresharma/monologue,kyle-annen/monologue,jaimerson/monologue,thiesa/monologue,jipiboily/monologue,jaimerson/monologue,kyle-annen/monologue,caitlingoldman/monologue,thiesa/monologue,jipiboily/monologue,caitlingoldman/monologue,munirent/monologue,GapIntelligence/monologue,jaimerson/monologue