Yarn workspaces compatibility

[MichalBryxi]

I believe I found a bug with Semantic-UI-Ember + yarn workspaces. I tried to create a minimal demonstrable example here. See README.

My best guess is that these lines cause the trouble. But I haven't been able to find a fix.

Other information:

 ember --version
ember-cli: 3.1.4
node: 10.11.0
os: linux x64

 yarn --version
1.10.1

Hope this help.