updated README

README.md

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+<img align="left" width="200" src="./docs/_static/logo_SyConn.png">
 
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-# SyConn
+-------------
 Refactored version of SyConn for automated synaptic connectivity inference based on dense EM segmentation data. For the first version
  see below or checkout the branch [dorkenwald2017nm](https://github.com/StructuralNeurobiologyLab/SyConn/tree/dorkenwald2017nm).