docs: update version in readme

Author: qxzzxq

README.md

@@ -27,7 +27,7 @@ You can start working by cloning [this template project](https://github.com/SETL
 <dependency>
  <groupId>io.github.setl-framework</groupId>
  <artifactId>setl_2.12</artifactId>
- <version>1.0.0-RC1</version>
+ <version>1.0.0-RC2</version>
 </dependency>
 ```