Module has no option to run postinstall scripts

Problem: When using the NPM module postinstall scripts do not run.

To reproduce:

1. Create a repo with a package.json, and another package.json nested in a folder.
2. Give the package.json in root the following script: "postinstall": "npm-recursive-install --skip-root".
3. Give the nested package.json the following script: "postinstall": "echo \"hi\""
4. Run npm install in the root folder

Result: The phrase hi will not echo in console.
Expected Result: The phrase hi will echo in console.