Update README.md

README.md

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 RDFSharp is a modular API made up of 3 layers: 
 
-<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.12.0/RDFSharp.Model-3.12.0.pdf">RDFSharp.Model</a></b>
+<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.13.0/RDFSharp.Model-3.13.0.pdf">RDFSharp.Model</a></b>
 <ul>
     <li>Create and manage <b><a href="https://www.w3.org/TR/rdf11-primer/">RDF models</a></b> (resources, literals, triples, graphs, namespaces, datatypes, ...)</li>
     <li>Exchange them using standard <b>RDF formats</b> (N-Triples, TriX, Turtle, RDF/Xml)</li>
     <li>Create and validate <b><a href="https://www.w3.org/TR/shacl/">SHACL shapes</a></b> (shape graphs, shapes, targets, constraints, reports, ...)</b></li>
 </ul>
 
-<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.12.0/RDFSharp.Store-3.12.0.pdf">RDFSharp.Store</a></b>
+<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.13.0/RDFSharp.Store-3.13.0.pdf">RDFSharp.Store</a></b>
 <ul>
     <li>Create and manage <b>RDF stores</b> for context-aware modeling of RDF data (contexts, quadruples, ...)</li>
     <li>Exchange them using standard <b>RDF formats</b> (N-Quads, TriX, TriG)</li>
     <li>Pick a store <a href="https://github.com/mdesalvo/RDFSharp.Extensions">extension</a> to save and query RDF data on many supported providers</li>
 </ul>
 
-<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.12.0/RDFSharp.Query-3.12.0.pdf">RDFSharp.Query</a></b>
+<b><a href="https://github.com/mdesalvo/RDFSharp/releases/download/v3.13.0/RDFSharp.Query-3.13.0.pdf">RDFSharp.Query</a></b>
 <ul>
     <li>Create and execute <b><a href="https://www.w3.org/TR/sparql11-query/">SPARQL queries</a></b> on graphs, stores, federations and SPARQL endpoints</li>
     <li>Create and execute <b><a href="https://www.w3.org/TR/sparql11-update/">SPARQL operations</a></b> on graphs, stores and SPARQL UPDATE endpoints</li>