Update README with the new released version

Author: ricardozanini

README.md

@@ -17,7 +17,7 @@ Add the following dependency to your project's `pom.xml` file:
 <dependency>
   <groupId>io.quarkiverse.openapi.generator</groupId>
   <artifactId>quarkus-openapi-generator</artifactId>
-  <version>0.1.0</version>
+  <version>0.2.0</version>
 </dependency>
 ```