Update README.md

README.md

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 [![badge-cc](https://codecov.io/gh/Parallel-in-Time/pySDC/branch/master/graph/badge.svg?token=hpP18dmtgS)](https://codecov.io/gh/Parallel-in-Time/pySDC)
 [![zenodo](https://zenodo.org/badge/26165004.svg)](https://zenodo.org/badge/latestdoi/26165004)
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 # Welcome to pySDC!