“ros_readbagfile" could print yaml standard saperate line between messages

[mxterry]

There is a standard characters as "dividing line" for save multiple YAML data in one single file:
"---" in a individual line.
With this dividing line, the output could be read with YAML format in many editors, such as VS Code.

Suggestion:
add "---" at the start of this string printing:

eRCaGuy_dotfiles/useful_scripts/ros_readbagfile.py

Line 169 in 4d0ab76

print("\n# =======================================")