Fixed typo

Author: radarhere

README.md

@@ -1409,7 +1409,7 @@ Take coding challenges every day, as many as you can.
     - make sure to watch information theory videos first
     - [x] Khan Academy Series: https://www.khanacademy.org/computing/computer-science/cryptography
     - [x] Cryptography: Hash Functions: https://www.youtube.com/watch?v=KqqOXndnvic&list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp&index=30
-    - [x] Cryptography: Encryptiom: https://www.youtube.com/watch?v=9TNI2wHmaeI&index=31&list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp
+    - [x] Cryptography: Encryption: https://www.youtube.com/watch?v=9TNI2wHmaeI&index=31&list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp
 
 - ### Compression
     - make sure to watch information theory videos first