Update of instutition name in README.txt
Change of instutition name of Ecole des ponts because of the merging with IPP https://ecoledesponts.fr/charte-graphique. No need to include that in the NEWS.txt (I guess).
Edited by Jean-Paul Travert
Change of instutition name of Ecole des ponts because of the merging with IPP https://ecoledesponts.fr/charte-graphique. No need to include that in the NEWS.txt (I guess).
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