Added info about mongo package to get rid of error on travis
Added info about mongo package to get rid of error on travis

acucchieri/Gaufrette,alex88/Gaufrette,igormukhingmailcom/Gaufrette,KnpLabs/Gaufrette,jenkoian/Gaufrette,ronaldlopez/Gaufrette,watermanio/Gaufrette,peelandsee/Gaufrette,acucchieri/Gaufrette,ronaldlopez/Gaufrette,igormukhingmailcom/Gaufrette,1001Pharmacies/Gaufrette,Consoneo/Gaufrette,KnpLabs/Gaufrette,1001Pharmacies/Gaufrette,alex88/Gaufrette,WayOfBrave/Gaufrette,watermanio/Gaufrette,NiR-/Gaufrette,NiR-/Gaufrette,jenkoian/Gaufrette,WayOfBrave/Gaufrette