fix bug in hello_world sample pom
fix bug in hello_world sample pom

alfishe/Rythm,BITPlan/Rythm,greenlaw110/Rythm,alfishe/Rythm,rythmengine/rythmengine,greenlaw110/Rythm,rythmengine/rythmengine,BITPlan/Rythm,rythmengine/rythmengine,greenlaw110/Rythm,BITPlan/Rythm,alfishe/Rythm