fix(python): update main.py, content_bytes() did not exist in Entry class. (#219)

Update main.py, content_bytes() did not exist in Entry class

In line 63, content_bytes() did not exist in Entry class. I just took line 118 from doc_test.py.

Author: aaron-galligan

python/main.py

@@ -60,7 +60,7 @@ async def main():
             # get key, hash, and content for each entry
             key = entry.key()
             hash = entry.content_hash()
-            content = await entry.content_bytes(doc)
+            content = await node.blobs().read_to_bytes(entry.content_hash())
             print("{} : {} (hash: {})".format(key.decode("utf8"), content.decode("utf8"), hash))
 
     input("Press Enter to exit...")