Update README.md

Author: khoih-prog

README.md

@@ -9,7 +9,7 @@
 ---
 ---
 
-### Releases v1.2.3-a
+### Releases v1.2.3.1
 
 1. Add back MD5/SHA1 authentication feature.
 4. Add example, update README.md, clean up.
@@ -1600,7 +1600,7 @@ Submit issues to: [AsyncWebServer_STM32 issues](https://github.com/khoih-prog/As
 ---
 ---
 
-### Releases v1.2.3-a
+### Releases v1.2.3.1
 
 1. Add back MD5/SHA1 authentication feature.
 4. Add example, update README.md, clean up.