Fix typo in README.md
`work` -> `for`.
@@ -8,7 +8,7 @@ RDFLib
[![PyPI](https://img.shields.io/pypi/v/rdflib.svg)](https://pypi.python.org/pypi/rdflib)
[![PyPI](https://img.shields.io/pypi/pyversions/rdflib.svg)](https://pypi.python.org/pypi/rdflib)
-RDFLib is a pure Python package work working with [RDF](http://www.w3.org/RDF/). RDFLib contains most things you need to work with RDF, including:
+RDFLib is a pure Python package for working with [RDF](http://www.w3.org/RDF/). RDFLib contains most things you need to work with RDF, including:
* parsers and serializers for RDF/XML, N3, NTriples, N-Quads, Turtle, TriX, Trig and JSON-LD (via a plugin).
* a Graph interface which can be backed by any one of a number of Store implementations
