Removed the unused import

Author: himi

org.omg.sysml.plantuml/src/org/omg/sysml/plantuml/VTree.java

@@ -30,7 +30,6 @@
 import org.omg.sysml.lang.sysml.CalculationUsage;
 import org.omg.sysml.lang.sysml.ConstraintUsage;
 import org.omg.sysml.lang.sysml.Element;
-import org.omg.sysml.lang.sysml.FeatureReferenceExpression;
 import org.omg.sysml.lang.sysml.FeatureTyping;
 import org.omg.sysml.lang.sysml.Membership;
 import org.omg.sysml.lang.sysml.Multiplicity;