tryolabs/norfair: v2.1.1

Release notes We release this patch release to fix a missing dependency on python 3.6 and 3.7. A new demo for panoptic perception and some updates to sahi demo and documentation are included as well. Changelog Fixes Fix importlib-metadata dependency bug affecting python 3.6 and 3.7 (#212) @javiber Demos Add panoptic driving perception demo using YOLOPv2 (#204) @DiegoFernandezC Update sahi demo to use their latest version (#214) @fcakyon Docs Add Getting started guide (#208) @javibe