snapshot ci badge

Signed-off-by: Damien Jeandemange <damien.jeandemange@artelys.com>

README.md

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 # PowSyBl Open Load Flow - Knitro Solver
 
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 PowSyBl (**Pow**er **Sy**stem **Bl**ocks) is an open source library written in Java, that makes it easy to write complex
 software for power systems’ simulations and analysis. Its modular approach allows developers to extend or customize its
 features.