remove unnecessary 1.8 JDT requirement
diff --git a/plugins/org.eclipse.viatra.modelobfuscator.runtime.uml/.settings/org.eclipse.jdt.core.prefs b/plugins/org.eclipse.viatra.modelobfuscator.runtime.uml/.settings/org.eclipse.jdt.core.prefs
index a698e59..ef8a789 100644
--- a/plugins/org.eclipse.viatra.modelobfuscator.runtime.uml/.settings/org.eclipse.jdt.core.prefs
+++ b/plugins/org.eclipse.viatra.modelobfuscator.runtime.uml/.settings/org.eclipse.jdt.core.prefs
@@ -1,12 +1,12 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=1.6
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.source=1.6