Update hello_world.py

hello_world.py

@@ -5,8 +5,9 @@ import click
 
 @click.command()
 @click.argument('name', nargs=1)
-def hello(name):
-    print("Hello {name}".format(name=name))
+@click.option('--cname', nargs=1, default='marvin')
+def hello(name, cname):
+    print("Hello {name}, my name is {cname}".format(name=name, cname=cname))
 
 
 if __name__ == '__main__':