Update dtls in readme

Author: julek-wolfssl

README.md

@@ -10,7 +10,7 @@ targeted for embedded, RTOS, and resource-constrained environments - primarily
 because of its small size, speed, and feature set.  It is commonly used in
 standard operating environments as well because of its royalty-free pricing
 and excellent cross platform support. wolfSSL supports industry standards up
-to the current [TLS 1.3](https://www.wolfssl.com/tls13) and DTLS 1.2, is up to
+to the current [TLS 1.3](https://www.wolfssl.com/tls13) and DTLS 1.3, is up to
 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20,
 Curve25519, Blake2b and Post-Quantum TLS 1.3 groups. User benchmarking and
 feedback reports dramatically better performance when using wolfSSL over