Update README

arXiv preprint link
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Author: larsgottesbueren

README.md

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 # HyperFlowCutter
-Prototype implementation of the HyperFlowCutter algorithm and its refinement variant for hypergraph bipartitioning, accompanying our publication to appear at ESA19. arXiv preprint available soon.
+Prototype implementation of the HyperFlowCutter algorithm and its refinement variant for hypergraph bipartitioning, accompanying our publication to appear at ESA19. arXiv preprint https://arxiv.org/abs/1907.02053. This is experimental code. It is only intended for comparison against other algorithms, not for use in a production system. 
 
 # Setup
 Get a recent C++17 ready compiler.