Add rss source for David Heinemeier Hansson blog

Author: jhengy

src/content_aggregator/__init__.py

@@ -90,6 +90,10 @@ def __init__(self):
                     'source_url': "https://feeds.feedburner.com/blogspot/RLXA",
                     'extract_type': 'rss',
                 },
+                {
+                    'source_url': "https://world.hey.com/dhh/feed.atom",
+                    'extract_type': 'rss',
+                },
             ],
             'max_articles': int(os.getenv('ARTICLES_LIMIT', 500)),
             'retry_delay_seconds': 15
@@ -248,4 +252,4 @@ def run():
         sys.exit(1)
 
 if __name__ == "__main__":
-    main()
+    main()