corrected gmf dependency

features/org.yakindu.base-feature/feature.xml

@@ -29,9 +29,9 @@
          id="de.itemis.xtext.utils.jface"
          version="0.0.0"/>
 
-   <includes
-         id="org.eclipse.gmf"
-         version="0.0.0"/>
+   <requires>
+      <import feature="org.eclipse.gmf" version="1.6.0.v20120517-1809-7d9X7FFYnmMJUVOKcqPSgIiK281V"/>
+   </requires>
 
    <plugin
          id="org.yakindu.base.types"