Update README.md

lichess-org · Jul 19, 2021 · b209b64 · b209b64
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 Watch [@arex](https://lichess.org/@/arex) explain fishnet.
 
-[![Video introduction](http://i3.ytimg.com/vi/C2SjcVbRfp0/maxresdefault.jpg)](https://youtu.be/C2SjcVbRfp0)
+[![Video introduction](https://i3.ytimg.com/vi/C2SjcVbRfp0/maxresdefault.jpg)](https://youtu.be/C2SjcVbRfp0)
 
 ## FAQ