`npm run json-api-nestjs:build` does not exist

[mmgroner]

In the README, the installation guide says to build by running npm run json-api-nestjs:build, which doesn't exist. Looking inside package.json, I see a script called demo:json-api, which fails due to a missing module (../tokenizer).

[hygison]

If you are interested, you can see how I have integrated this work into my api: https://github.com/hygison/json-api-usage

[klerick]

I have changed README.md