Release v360 broke deployments

With v360 released in #265 , deployments fail with:

```
-----> Pruning devDependencies
       Running 'yarn scalingo prune'
       Usage Error: Couldn't find a script named "scalingo".
       
       $ yarn run [--inspect] [--inspect-brk] [-T,--top-level] [-B,--binaries-only] [--require #0] <scriptName> ...
-----> Build failed
```

PR #265 has been reverted in #266 