Add note about Version module to README

[pedro042]

Hi Igor,

I spent hours (actually days) to get this component working. I had getting error like "Unknown module pyhaversion" or so (I don've the logs). And the solution was very simple - enable Version module https://www.home-assistant.io/integrations/version
Please add note to README file about this (HA-SleepAsAndroid requires Version module enabled).
I installed it directly, just copied it to custom_components directory without HACS

Great work, thank you very much for this component!

[IATkachenko]

@pedro042, hello.

Sorry for this.

I'm using

default: 

set in configuration.yaml, and it seems that version is in this set.

I'll update readme and add dependency. Other option is completely remove version check and bump minimal Home Assistant version for the integration: version is used to keep compatibility with old versions of HomeAssistant.

Looks like first simplest solution will be add info to README, and then I'll review code.

[IATkachenko]

Actually we don't need this integration. There is only pyhaversion python module is needed from its requirements.
Fixed in v1.9.1 by adding it to own requirements.