updated URIs, readme, license (file) and version info

LICENSE

-Copyright 2019 ETSI
+Copyright 2020 ETSI
 
 Redistribution and use in source and binary forms, with or without 
 modification, are permitted provided that the following conditions are met:

README.md

-Repository for the SAREF for Building ontology.
+Repository for the SAREF4BLDG ontology, an extension of SAREF for the building domain.
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