Migration from API v1 to v2.0.0

[godismyjudge95]

Ulauncher just released a new version and it broke this extension.
See here:
https://mailchi.mp/fbb4b54c426a/ulauncher-is-migrating-to-python-3-changes-to-extension-api-and-more

And here:
http://docs.ulauncher.io/en/latest/extensions/migration.html

[seqizz]

Thanks for the heads up. Unfortunately I am no longer using Ulauncher since it wasn't possible to build it for NixOs. Yet there seems to be an MR now.
I'll keep this open so I can migrate my plugins when I have some time.

[godismyjudge95]

@seqizz I'd be happy to help out if you wouldn't mind.

[seqizz]

I'd be thankful. I can also cheat by using your changes as an example for other plugins.