Update README

README.md

@@ -16,7 +16,8 @@ The API documentation can be found [here](https://hexdocs.pm/rdf/). For a guide
 - in-memory data structures for RDF descriptions, RDF graphs and RDF datasets
 - ability to execute [SPARQL] queries against the in-memory data structures via the [SPARQL.ex] package or against any SPARQL endpoint via the [SPARQL.Client] package
 - support for RDF vocabularies via Elixir modules for safe, i.e. compile-time checked and concise usage of IRIs
-- XML schema datatypes for RDF literals (not yet all supported)
+- support for most of the important XML schema datatypes for RDF literals
+- ability to define custom datatypes for RDF literals, incl. as derivations of XSD datatypes via facets 
 - sigils for the most common types of nodes, i.e. IRIs, literals, blank nodes and lists
 - a description DSL resembling Turtle in Elixir
 - implementations for the [N-Triples], [N-Quads] and [Turtle] serialization formats; [JSON-LD] is implemented in the separate [JSON-LD.ex] package
@@ -27,11 +28,7 @@ The API documentation can be found [here](https://hexdocs.pm/rdf/). For a guide
 
 There's still much to do for a complete RDF ecosystem for Elixir, which means there are plenty of opportunities for you to contribute. Here are some suggestions:
 
-- more serialization formats
-    - [RDFa]
-    - [RDF-XML]
-    - [N3]
-    - et al.
+- more serialization formats, like [RDFa], [RDF-XML], [N3], [CSVW], [HDT] etc.
 - more XSD datatypes
 - improve documentation
 
@@ -46,7 +43,7 @@ If you need help with your Elixir and Linked Data projects, just contact <info@c
 
 ## License and Copyright
 
-(c) 2017-2019 Marcel Otto. MIT Licensed, see [LICENSE](LICENSE.md) for details.
+(c) 2017-2020 Marcel Otto. MIT Licensed, see [LICENSE](LICENSE.md) for details.
 
 
 [RDF.ex]:               https://hex.pm/packages/rdf
@@ -58,8 +55,10 @@ If you need help with your Elixir and Linked Data projects, just contact <info@c
 [N-Quads]:              https://www.w3.org/TR/n-quads/
 [Turtle]:               https://www.w3.org/TR/turtle/
 [N3]:                   https://www.w3.org/TeamSubmission/n3/
-[JSON-LD]:              http://www.w3.org/TR/json-ld/
+[JSON-LD]:              https://www.w3.org/TR/json-ld/
 [RDFa]:                 https://www.w3.org/TR/rdfa-syntax/
 [RDF-XML]:              https://www.w3.org/TR/rdf-syntax-grammar/
+[CSVW]:                 https://www.w3.org/TR/tabular-data-model/
+[HDT]:                  http://www.rdfhdt.org/
 [SPARQL]:               https://www.w3.org/TR/sparql11-overview/
 [ShEx]:                 https://shex.io/