Update README.md

Author: riti2409

README.md

@@ -3,10 +3,6 @@ DBMS_SQL Notes
 
 - GitHub Repo : https://github.com/riti2409/DBMS_SQL-Notes
 
-- Source : https://www.youtube.com/playlist?list=PLxCzCOWd7aiFAN6I8CuViBuCdJgiOkT2Y (Gate Smashers)
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-  https://www.youtube.com/playlist?list=PLL8qj6F8dGlSZYUFrX6ASTdFWiUlLjguc (Tutorials space)
-
 - PDF(of notes): https://drive.google.com/file/d/1XGU4dusm9IV2DzBnuKhrrM_o7hUIt7NT/view?usp=sharing
 
 - For Practice : https://www.hackerrank.com/domains/sql