Fix the link to Javadocs

Author: dmitry-timofeev

exonum-java-binding/README.md

@@ -10,7 +10,7 @@ configure a network of nodes and run your services in it.
 
 For more information see the relevant documentation on the tool:
   - [User Guide](https://exonum.com/doc/version/0.13-rc.2/get-started/java-binding/)
-  - [Javadocs](https://exonum.com/doc/api/java-binding/0.8.0/index.html)
+  - [Javadocs](https://exonum.com/doc/api/java-binding/0.9.0-rc1/index.html)
   - [Cryptocurrency Example Service](cryptocurrency-demo)
 
 ## License