Let's use an opengraph version for python3

apps/rp/models.py

@@ -6,7 +6,7 @@ from taggit.managers import TaggableManager
 from newspaper import Article as ArticleParser
 from django_und.models import VoteMixin
 from django_fsm import FSMField, transition, RETURN_VALUE
-import opengraph as og
+import opengraph_py3 as og
 
 from io import BytesIO
 from datetime import datetime

requirements.txt

@@ -15,5 +15,5 @@ url
 coreapi
 pygments
 markdown
-opengraph
+opengraph-py
 -e git+https://github.com/mariocesar/sorl-thumbnail.git#egg=sorl-thumbnail