Update README.md

Author: zlatko-minev

README.md

@@ -9,12 +9,11 @@ Welcome to pyEPR :beers:!      (see [arXiv:2010.00620](
 
 ### Automated Python module for the design and quantization of Josephson quantum circuits
 
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-## Documentation
+### Documentation
 
 [Read the docs here.](https://pyepr-docs.readthedocs.io)
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 ## Scientific work:
 * Minev, Z. K., Leghtas, Z., Mudhada, S. O., Reinhold, P., Diringer, A., & Devoret, M. H. (2018). [pyEPR: The energy-participation-ratio (EPR) open-source framework for quantum device design.](https://github.com/zlatko-minev/pyEPR/blob/master/pyEPR.bib)