updated readme

Author: dnschouten

README.md

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    <a href="https://github.com/computationalpathologygroup/pythostitcher/releases"><img alt="empty" src=https://img.shields.io/github/v/release/computationalpathologygroup/pythostitcher?include_prereleases&label=pre-release&logo=github.svg></a>
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 ## What is PythoStitcher?
 Pythostitcher is a Python implementation of the [AutoStitcher](https://www.nature.com/articles/srep29906) software which stitches histopathology images into an artifical whole mount image. These artificial whole-mounts are indispensable for multimodal imaging research, since they greatly improve the ability to relate histopathology information to pre-operative imaging. PythoStitcher works fully automatically and is able to generate very high resolution (0.25 µm/pixel) whole-mounts.