audit: bypass artifact check for vifm-osx-0.11

```
==> FAILED
Formula/vifm.rb:4:3: C: https://github.com/vifm/vifm/releases/download/v0.11/vifm-osx-0.11.tar.bz2 looks like a binary package, not a source archive; homebrew/core is source-only.
  url "https://github.com/vifm/vifm/releases/download/v0.11/vifm-osx-0.11.tar.bz2"
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```