Update README.md

Marco Arena · web-flow · commit 8925c752e70c · 2017-12-10T11:43:48.000+01:00
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 # C++ Day 2017
 Slides and material of the event happened on December 2 in Milan.
+Videos are all in the italian language.
 
 [Youtube playlist](https://www.youtube.com/playlist?list=PLsCm1Hs016LWK086XR-QgAKchfclBOL7O)
 
