Update README.md

Author: wolgemoth

README.md

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-# C++ Hashmap (2.0.2)
+# C++ Hashmap (2.3.0)
 
 ## Table of Contents
 
@@ -77,4 +77,4 @@ Therefore, if you need to perform a synchronous series of operations on the Hash
 
 ### References
 
-- Wang, Q. (Harry) (2020). Implementing Your Own HashMap (Explanation + Code). YouTube. Available at: https://www.youtube.com/watch?v=_Q-eNqTOxlE [Accessed 2021].
+- Wang, Q. (Harry) (2020). Implementing Your Own HashMap (Explanation + Code). YouTube. Available at: https://www.youtube.com/watch?v=_Q-eNqTOxlE [Accessed 2021].