Update README.md

Author: pgleeson

README.md

@@ -25,3 +25,5 @@ NeuroML 2 [here](https://github.com/OpenSourceBrain/AllenInstituteNeuroML/tree/m
 The code in this repository is provided under the terms of the [software license](LICENSE) included with it. If you use this model in your research, we respectfully ask you to cite the references outlined in the [CITATION](CITATION.md) file.
 
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