Updated "getting started" instructions for XCode 8.0 dependency.
Updated "getting started" instructions for XCode 8.0 dependency.

Review: https://reviews.apache.org/r/58311

neilconway/mesos,zmalik/mesos,neilconway/mesos,asamerh4/mesos,Gilbert88/mesos,zmalik/mesos,verizonlabs/mesos,Gilbert88/mesos,andschwa/mesos,zmalik/mesos,neilconway/mesos,chhsia0/mesos,kaysoky/mesos,gsantovena/mesos,kaysoky/mesos,andschwa/mesos,asamerh4/mesos,abudnik/mesos,gsantovena/mesos,andschwa/mesos,reneploetz/mesos,reneploetz/mesos,Gilbert88/mesos,chhsia0/mesos,andschwa/mesos,reneploetz/mesos,verizonlabs/mesos,andschwa/mesos,zmalik/mesos,kaysoky/mesos,asamerh4/mesos,abudnik/mesos,verizonlabs/mesos,jpeach/mesos,gsantovena/mesos,dforsyth/mesos,chhsia0/mesos,dforsyth/mesos,kaysoky/mesos,reneploetz/mesos,dforsyth/mesos,chhsia0/mesos,verizonlabs/mesos,Gilbert88/mesos,neilconway/mesos,Gilbert88/mesos,Gilbert88/mesos,verizonlabs/mesos,verizonlabs/mesos,jpeach/mesos,reneploetz/mesos,kaysoky/mesos,zmalik/mesos,gsantovena/mesos,zmalik/mesos,abudnik/mesos,gsantovena/mesos,reneploetz/mesos,verizonlabs/mesos,abudnik/mesos,abudnik/mesos,andschwa/mesos,jpeach/mesos,jpeach/mesos,chhsia0/mesos,dforsyth/mesos,jpeach/mesos,neilconway/mesos,neilconway/mesos,gsantovena/mesos,abudnik/mesos,abudnik/mesos,chhsia0/mesos,dforsyth/mesos,gsantovena/mesos,reneploetz/mesos,asamerh4/mesos,kaysoky/mesos,asamerh4/mesos,dforsyth/mesos,jpeach/mesos,jpeach/mesos,andschwa/mesos,neilconway/mesos,Gilbert88/mesos,asamerh4/mesos,asamerh4/mesos,dforsyth/mesos,chhsia0/mesos,kaysoky/mesos,zmalik/mesos