DOC: make README more clear
DOC: make README more clear

glenioborges/ibis,laserson/ibis,Supermem/ibis,deepfield/ibis,aslihandincer/ibis,laserson/ibis,adamobeng/ibis,korotkyn/ibis,koverholt/ibis,Supermem/ibis,adamobeng/ibis,korotkyn/ibis,cpcloud/ibis,adamobeng/ibis,glenioborges/ibis,wesm/ibis,mariusvniekerk/ibis,laserson/ibis,ibis-project/ibis,cloudera/ibis,wesm/ibis,ashhher3/ibis,Supermem/ibis,korotkyn/ibis,korotkyn/ibis,aslihandincer/ibis,koverholt/ibis,cpcloud/ibis,deepfield/ibis,adamobeng/ibis,mariusvniekerk/ibis,wesm/ibis,deepfield/ibis,ashhher3/ibis,Supermem/ibis,cloudera/ibis,mariusvniekerk/ibis,koverholt/ibis,deepfield/ibis,glenioborges/ibis,ashhher3/ibis,cpcloud/ibis,cpcloud/ibis,glenioborges/ibis,ibis-project/ibis,aslihandincer/ibis,aslihandincer/ibis,ibis-project/ibis,cloudera/ibis,laserson/ibis,ibis-project/ibis,koverholt/ibis,mariusvniekerk/ibis,ashhher3/ibis