(temporarily) disable updates for a module

[IzzySoft]

I have a module in my collection where the Github repo was (maybe temporarily) set to private (or was removed, I do not know) – see #13). So I would like to (temporarily) disable that module to avoid errors on cli.py sync. Setting upload_to to an empty string leads to

Sync ERROR: unlimited-hotspot: update module failed: AttributeError('NoneType' object has no attribute 'replace')

Maybe some disabled property (defaulting to 0 or false) would be needed? Simply accepting the URL can be empty (for this reason) might work as well, but one might just want to temporarily disable a module for some reason, so a better approach would probably be

  "disable": "<reason why this module should be excluded from modules.json>",
  "disable_updates": "<reason why update checks should be skipped for this module>"

This way

• the URL can be kept
• updates can easily be re-enabled
• one keeps a pointer on the reason to follow up
• one can easily list disabled modules