Minor improvement to README
Minor improvement to README

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