Issue/1913 modifications resource metadata

coscine/issues#1913

src/Migrations/Assets/Licenses.rdf

 <?xml version="1.0" encoding="utf-8" ?>
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
-
+  
   <rdf:Description rdf:about="https://spdx.org/licenses/Apache-2.0">
     <rdf:about>https://spdx.org/licenses/Apache-2.0</rdf:about>
     <rdfs:label xml:lang="en">Apache License 2.0</rdfs:label>