Update README

Author: NicolasGensollen

README.md

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 # IntervalUnions.jl
+
+[![Build Status](https://travis-ci.com/juliastreamgraphs/IntervalUnions.jl.svg?branch=master)](https://travis-ci.com/juliastreamgraphs/IntervalUnions.jl)
+
 Julia package to work with unions of intervals.
+
+## License
+
+StreamGraphs  is released under a BSD [license](https://github.com/NicolasGensollen/StreamGraphs.jl/blob/master/LICENSE).
+
+## Contact
+
+If you are having issues using StreamGraphs, feel free to open an Issue [here](https://github.com/NicolasGensollen/StreamGraphs.jl/issues/new)
+
+For questions about collaboration please email [Nicolas Gensollen](mailto:[email protected])