Add npm secret

[jorgebodega]

Npm secret is required on release system in order to deploy the package to npm registry.

Github package registry is already working with autogenerated secret.

[hirsch88]

@jorgebodega just added you at npm as a maintainer. hope thats is what you need? Sorry for my delay

[jorgebodega]

Hi! Welcome back @hirsch88!

To be a maintainer at NPM is one of the steps, but I also need to be maintainer here to set some env variables, or maybe you can set it.

Also will be great if you can check on the work I've doing on the fork at https://github.com/jorgebodega/typeorm-seeding, trying to improve factories, some bugs... Do you think we can take those changes?