DOC: readme typo (thanks @keflavich)
DOC: readme typo (thanks @keflavich)

wesm/ibis,cpcloud/ibis,deepfield/ibis,koverholt/ibis,laserson/ibis,deepfield/ibis,koverholt/ibis,cloudera/ibis,mariusvniekerk/ibis,koverholt/ibis,mariusvniekerk/ibis,deepfield/ibis,deepfield/ibis,ibis-project/ibis,wesm/ibis,koverholt/ibis,mariusvniekerk/ibis,mariusvniekerk/ibis,laserson/ibis,cpcloud/ibis,ibis-project/ibis,ibis-project/ibis,cloudera/ibis,cpcloud/ibis,wesm/ibis,cpcloud/ibis,cloudera/ibis,ibis-project/ibis,laserson/ibis,laserson/ibis