Ensure compatibility with NPM 7 and 8

[driehle]

@MatteoMeil

The field process.env.npm_config_argv was removed with NPM 7, leading to issues during the installation of this package. This commit updates the package to rely on the NODE_ENV during installation.

See also https://github.com/npm/rfcs/blob/main/implemented/0021-reduce-lifecycle-script-environment.md and https://github.com/npm/cli/issues/1995.

It would be great if you could merge and release!