a bit of changelog
+2017/01/2X RELEASE 4.2.2
+========================
+
+This is a bug-fix release, and the last release in the 4.X series.
+
+Bug fixes:
+----------
+* Many SPARQL Engine fixes for aggregates, subqueries, variable-scope
+ [#404](https://github.com/RDFLib/rdflib/issues/404)
+ [#580](https://github.com/RDFLib/rdflib/issues/580)
+ [#607](https://github.com/RDFLib/rdflib/issues/607)
+ [#615](https://github.com/RDFLib/rdflib/issues/615)
+ [#619](https://github.com/RDFLib/rdflib/issues/619)
+ [#628](https://github.com/RDFLib/rdflib/issues/628)
+ [#631](https://github.com/RDFLib/rdflib/issues/631)
+
+
+* initBindings in SPARQL queries finally work everywhere
+ [#294](https://github.com/RDFLib/rdflib/issues/294)
+
+* A handful of Trig serialisation issues
+
+ [#433](https://github.com/RDFLib/rdflib/issues/433)
+ [#679](https://github.com/RDFLib/rdflib/issues/679)
+ [#428](https://github.com/RDFLib/rdflib/issues/428)
+
+
+* Improved support for base64 encoded literals
+ [#646](https://github.com/RDFLib/rdflib/issues/646)
+
+* A handful of bugs around orderability on py3
+ [#676](https://github.com/RDFLib/rdflib/issues/676)
+ [#613](https://github.com/RDFLib/rdflib/issues/613)
+ [#648](https://github.com/RDFLib/rdflib/issues/648)
+ [#653](https://github.com/RDFLib/rdflib/issues/653)
+
+* Improved performance of managing large collections
+ [#609](https://github.com/RDFLib/rdflib/issues/609)
+
+* And many other minor things!
+
2015/08/12 RELEASE 4.2.1
========================
