Travis: execute in single-threaded mode
Travis: execute in single-threaded mode

ringoluo/mapdb,morfeo8marc/mapdb,jankotek/MapDB,ffjiao/mapdb,codeaudit/mapdb,jankotek/mapdb,jankotek/MapDB,binarytemple/mapdb,sumit784/mapdb,jankotek/mapdb,SleimanJneidi/mapdb,pettermahlen/mapdb,lamfire/mapdb,cocosli/mapdb,hangum/mapdb