How to <git submodule update> with Ansible's Git module ?

Hi Ansible-Community,

first of all I would like to mention that I am quite proud to be part of the Ansible Community.
I introduced Ansible within some innovative Robotic-related projects inside a large company where I am working, and so far everyone is happy.

When porting somebody elses code to Ansible 2.x, i found the following code block:

shell: git submodule update --init

Ansible gives me a warning:

[WARNING]: Consider using git module rather than running git

My question: What is the equivalent of that shell command by using the Ansible git module, in order to get rid of the warning?

I am a bit new to Git submodules, and all that the Git module tells me about submodules is that I can track_submodules yes/no, but I have no idead what it translates to shell-command-wise.

Thanks for helping out!!

Best from Munich
Sören