Update README

Author: thiagodp

README.md

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 # codeceptjs-dbhelper
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+[![npm version](https://badge.fury.io/js/codeceptjs-dbhelper.svg)](https://badge.fury.io/js/codeceptjs-dbhelper)
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 > Let your CodeceptJS tests talk to databases
 
 This is a [Helper](https://codecept.io/helpers/) for [CodeceptJS](https://codecept.io/) that allows you to execute queries or commands to databases using [database-js](https://github.com/mlaanderson/database-js). That is, your tests written for CodeceptJS now will be able to access databases easily. **It is especially useful for preparing databases before/after executing test cases.**