Update README.md

Author: pgleeson

README.md

@@ -7,3 +7,5 @@ A repository for testing interactions/conversions between NeuroML & [PyNN](h
 See here: https://github.com/NeuroML/NeuroML2/issues/73 for current plans/updates re NeuroML & PyNN.
 
 See also: https://github.com/NeuralEnsemble/Networks_SIG/issues?q=is%3Aissue+is%3Aopen+label%3APyNN 
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