fix python version compatibility
@@ -57,7 +57,9 @@ If you make a pull-request to RDFLib on GitHub, travis will automatically test y
Compatibility
-------------
-RDFLib>=5.0.0 tries to be compatible with python versions 2.7, 3.5, 3.6, 3.7.
+RDFLib 5.x.y tries to be compatible with python versions 2.7, 3.4, 3.5, 3.6, 3.7.
+
+The current master branch (with will release as 6.0.0) will only support Python 3.5 and newer.
Releasing
