Update README.md

Author: didinj

README.md

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 This source code is part of [Node.js, Express.js, Sequelize.js and PostgreSQL RESTful API](https://www.djamware.com/post/5b56a6cc80aca707dd4f65a9/nodejs-expressjs-sequelizejs-and-postgresql-restful-api) tutorial.
 
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 To run locally: