Recently added deoplete sources are not working for 0.19

[kornicameister]

It seems that recently added deoplete completion is not exactly working with Elm 0.19 projects.
Whenever I am typing, I get interrupted by error in echo area that says either:

• elm-oracle binary not found
• obviously installing it, changes the error to the one that says elm-package.json could not be found, because of Support for Elm 0.19 elm-oracle#26

What is expected next step here to make everything work as it was working?