Update README.org to include switching to Collect's collect4 branch.
Update README.org to include switching to Collect's collect4 branch.

openforis/collect-earth-online,billyz313/collect-earth-online,openforis/collect-earth-online,tdev2308/collect-earth-online,billyz313/collect-earth-online,billyz313/collect-earth-online,tdev2308/collect-earth-online