[java decompiler] engine source/target level set to Java 8

build.xml

@@ -26,7 +26,7 @@
 
   <target name="compile" depends="init,clean">
     <mkdir dir="${out}"/>
-    <javac srcdir="${src}" destdir="${out}" source="1.6" target="1.6" encoding="UTF-8" debug="true" includeantruntime="false"/>
+    <javac srcdir="${src}" destdir="${out}" source="1.8" target="1.8" encoding="UTF-8" debug="true" includeantruntime="false"/>
   </target>
 
   <target name="dist" depends="init,compile">

java-decompiler-engine.iml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />