Dependency on json_prolog_msgs

[AbdelrhmanBassiouny]

Hello,

First of all thanks a lot for making your work public!

So while installing the package, I faced an issue where json_prolog_msgs was not found, and it is not available for installation as a published ROS package, after some dappling around, I found that it was included as part of the iai_common_msgs.

It would help to add a link to it in the readme or maybe publish it as a ROS noetic package and add it as a dependency in the readme.

Cheers!

[daniel86]

Thanks for the report! Yes, you are right dependencies should be listed in the README