class_docstr: Convert msg spec V4 to V5
class_docstr_tok: ["Convert","msg","spec","V4","to","V5"]
code: def stream(self, msg):
      content = msg["content"]
      content["text"] = content.pop("data")
      return msg
  
imports: import re
  import json
  from jupyter_client import protocol_version_info
label_desc: Use image node_id 9 for calling the V4toV5 obj's underlying member method code with example usage: obj.stream(msg) and returns: msg