Update README.

README.md

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-# RelAST Preprocessor Version 0.2.4
+# RelAST Preprocessor
 
 ![RelAST process](relast-process.png)
 
+See [releases page](/../../releases) for the latest version.
+
 The RelAST preprocessor takes a `.relast` file as input comprising AST rules and relations. It produces files that afterwards are processed by JastAdd to generated Java code.
 To use it in your project, build the JAR file running