changed execution environment to java 1.5

test-plugins/org.yakindu.sct.model.stext.resource.test/META-INF/MANIFEST.MF

@@ -4,6 +4,6 @@ Bundle-Name: Test
 Bundle-SymbolicName: org.yakindu.sct.model.stext.resource.test
 Bundle-Version: 1.0.0.qualifier
 Fragment-Host: org.yakindu.sct.model.stext.resource;bundle-version="1.0.0"
-Bundle-RequiredExecutionEnvironment: JavaSE-1.7
+Bundle-RequiredExecutionEnvironment: J2SE-1.5
 Require-Bundle: org.junit,
  de.itemis.xtext.utils.jface;bundle-version="1.0.0"