updated README
updated README

potree/PotreeConverter,sverhoeven/PotreeConverter,potree/PotreeConverter,kyroskoh/PotreeConverter,potree/PotreeConverter,eokeeffe/PotreeConverter,Georepublic/PotreeConverter,kyroskoh/PotreeConverter,eokeeffe/PotreeConverter,Georepublic/PotreeConverter,eokeeffe/PotreeConverter,sverhoeven/PotreeConverter,kyroskoh/PotreeConverter,potree/PotreeConverter,potree/PotreeConverter,potree/PotreeConverter,sverhoeven/PotreeConverter,potree/PotreeConverter,sverhoeven/PotreeConverter,Georepublic/PotreeConverter,Georepublic/PotreeConverter,kyroskoh/PotreeConverter