[misc] correcting README to RC

README.md

@@ -32,7 +32,7 @@ or maven :
 ```
 
 New version 3.0 is a complete rewrite with code simplification, reduced size (15%), more than 90% coverage tested, with performance gain.
-But still in beta for now:
+But still in RELEASE CANDIDATE for now:
 ```script
 <dependency>
     <groupId>org.mariadb.jdbc</groupId>