Yarn Error on attempted installation| The engine "node" is incompatible with this module

Hi,
I am using no v7.3.0, npm v4.3.0, yarn v0.21.3 and @angular/cli v1.0.0-rc.0

Installing a new angular-cli and run yarn and yarn installs without any issues.
I then attempt to install as shown below...
`yarn add ng2-smart-table`

... and receive the following error:

```
error ng2-smart-table@0.5.3-0: The engine "node" is incompatible with this module. Expected version ">= 5.4.1 < 7".
error Found incompatible module
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
```

Yarn does not installs ng2-smart-table. I noticed that you also use yarn in your development. Could you please check and see what is happening with yarn and ng2-smart-table? I use it heavily and would like to use yarn in my project.

NB: Running the following
`npm i ng2-smart-table --save`

... installs without any issues.

Thanks