Minor fixes to README.
Minor fixes to README.

NationalGenomicsInfrastructure/charon,NationalGenomicsInfrastructure/charon,pekrau/charon,pekrau/charon,NationalGenomicsInfrastructure/charon,Galithil/charon,Galithil/charon,Galithil/charon,pekrau/charon