TypeError: Object of type 'Entities' is not JSON serializable IBM Cloud natural language understanding

import json
from watson_developer_cloud import NaturalLanguageUnderstandingV1
import watson_developer_cloud.natural_language_understanding.features.v1 \
as Features

natural_language_understanding = NaturalLanguageUnderstandingV1(
username="username",
password="password",
version="2017-02-27")

response = natural_language_understanding.analyze(
text="IBM is an American multinational technology company headquartered \
in Armonk, New York, United States, with operations in over 170 \
countries.",
features=[
Features.Entities(
  emotion=True,
  sentiment=True,
  limit=2
),
Features.Keywords(
  emotion=True,
  sentiment=True,
  limit=2
)
 ]
 )

print(json.dumps(response, indent=2))

I am new to IBM watson API .....i was trying this sample code provided by them by I was getting this error

TypeError: Object of type 'Entities' is not JSON serializable

Got the solution from the IBM developer works here is the link

just replace

features=[
   Features.Entities(
          emotion=True,
          sentiment=True,
           limit=2
    ),
   Features.Keywords(
           emotion=True,
           sentiment=True,
           limit=2
    )
]

with :

features=Features(entities=EntitiesOptions(
                      emotion=True, sentiment=True,limit=2), 
               keywords=KeywordsOptions(
                      emotion=True, sentiment=True,limit=2
                                ))

this is due to the changes done in v 1 python sdk Here is the link showing the changes made in v 1 python sdk