Mention RDF/XML 1.2 in README

Author: rubensworks

README.md

@@ -4,7 +4,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/rdfjs/rdfxml-streaming-parser.js/badge.svg?branch=master)](https://coveralls.io/github/rdfjs/rdfxml-streaming-parser.js?branch=master)
 [![npm version](https://badge.fury.io/js/rdfxml-streaming-parser.svg)](https://www.npmjs.com/package/rdfxml-streaming-parser)
 
-A [fast](https://gist.github.com/rubensworks/a351f394ca6b70d6ad4ec1adc691a453), _streaming_ [RDF/XML](https://www.w3.org/TR/rdf-syntax-grammar/) parser
+A [fast](https://gist.github.com/rubensworks/a351f394ca6b70d6ad4ec1adc691a453), _streaming_ [RDF/XML 1.2](https://www.w3.org/TR/rdf12-xml/) parser
 that outputs [RDFJS](http://rdf.js.org/)-compliant quads.
 
 ## Installation