Update README.md

Author: pzim-devdata

data-viz/README.md

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 [Plus de graphes](https://github.com/pzim-devdata/DATA-developer/tree/master/data-viz/static)
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+--------------------------------------------
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+## - [Licence](https://github.com/pzim-devdata/DATA-developer/raw/master/LICENSE)
+MIT License
+Copyright (c) 2019 pzim-devdata
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+--------------------------------------------
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+## - [Contact :email:](mailto:[email protected]?subject=Contact%20from%20Github)
+Created by [@pzim](https://www.pzim.fr/) - feel free to contact me!
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