Update README.md

Author: segiddins

README.md

@@ -65,7 +65,7 @@ This library supports the following algorithms:
 - None - Unsecured JWTs
 - HS256 - HMAC using SHA-256 hash algorithm (default)
 - HS384 - HMAC using SHA-384 hash algorithm
-- HS512 - HMAC using SHA-384 hash algorithm
+- HS512 - HMAC using SHA-512 hash algorithm
 
 ## License