chore: release 8.3.0 (INRIA#3647)

Author: monperrus

pom.xml

@@ -18,7 +18,7 @@
 
   <artifactId>spoon-core</artifactId>
   <packaging>jar</packaging>
-  <version>8.3.0-SNAPSHOT</version>
+  <version>8.4.0-SNAPSHOT</version>
   <name>Spoon Core</name>
   <description>Spoon is a tool for meta-programming, analysis and transformation of Java programs.</description>
   <url>http://spoon.gforge.inria.fr/</url>