Update README.md

Author: WebDevSimplified

README.md

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-# Learn SQL in _____ Minutes
-If you haven't already make sure you watch [this video](https://www.youtube.com/WebDevSimplified) which will teach you all the basics of SQL in _____ minutes.
+# Learn SQL
+If you haven't already make sure you watch [this video](https://youtu.be/p3qvj9hO_Bo) which will teach you all the basics of SQL in 60 minutes.
 
 After watching the video try to complete the exercises listed below using the data provided in this repository.