Fix maven-java-formatter-plugin version in core maven config

Change-Id: Icbe5318ea5b7d5184b70c71a639b36da9242a003
diff --git a/core/pom.xml b/core/pom.xml
index 05faeee..887027d 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -32,7 +32,7 @@
 			<plugin>
 				<groupId>com.googlecode.maven-java-formatter-plugin</groupId>
 				<artifactId>maven-java-formatter-plugin</artifactId>
-				<version>${project.version}</version>
+				<version>0.4</version>
 				<configuration>
 					<configFile>${project.basedir}/Format.xml</configFile>
 					<overrideConfigCompilerVersion>true</overrideConfigCompilerVersion>