Merge pull request #1787 from gjhiggins/edit-readme

Edit readme

README.md

@@ -22,11 +22,17 @@ The RDFlib community maintains many RDF-related Python code repositories with di
 * [rdflib](https://github.com/RDFLib/rdflib) - the RDFLib core
 * [sparqlwrapper](https://github.com/RDFLib/sparqlwrapper) - a simple Python wrapper around a SPARQL service to remotely execute your queries
 * [pyLODE](https://github.com/RDFLib/pyLODE) - An OWL ontology documentation tool using Python and templating, based on LODE.
+* [pyrdfa3](https://github.com/RDFLib/pyrdfa3) - RDFa 1.1 distiller/parser library: can extract RDFa 1.1/1.0 from (X)HTML, SVG, or XML in general.
+* [pymicrodata](https://github.com/RDFLib/pymicrodata) - A module to extract RDF from an HTML5 page annotated with microdata. 
+* [pySHACL](https://github.com/RDFLib/pySHACL) - A pure Python module which allows for the validation of RDF graphs against SHACL graphs.
+* [OWL-RL](https://github.com/RDFLib/OWL-RL) - A simple implementation of the OWL2 RL Profile which expands the graph with all possible triples that OWL RL defines.
 
 Please see the list for all packages/repositories here:
 
 * <https://github.com/RDFLib>
 
+Help with maintenance of all of the RDFLib family of packages is always welcome and appreciated.
+
 ## Versions & Releases
 
 * `6.2.0-alpha` current `master` branch