fixing usage

Author: astroDEX2020

swagger2puml-core/src/main/java/com/kicksolutions/swagger/Swagger2PlantUML.java

@@ -14,7 +14,9 @@
 public class Swagger2PlantUML 
 {
 	private static final Logger LOGGER = Logger.getLogger(Swagger2PlantUML.class.getName());
-	private static final String USAGE = new StringBuilder().append(" Usage: com.kicksolutions.swagger.plantuml.Swagger2PlantUML <options> \n")
+	private static final String USAGE = new StringBuilder()
+			.append(" Usage: ")
+			.append(Swagger2PlantUML.class.getName()).append(" <options> \n")
 			.append(" -i <spec file> ")
 			.append(" -o <output directory> ")
 			.append(" -generateDefinitionModelOnly true/false; Default=false ")