Add tippin me button

README.md

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 [![Build Status](https://img.shields.io/travis/seppevs/migrate-mongo.svg?style=flat)](https://travis-ci.org/seppevs/migrate-mongo) [![Coverage Status](https://coveralls.io/repos/github/seppevs/migrate-mongo/badge.svg?branch=master)](https://coveralls.io/r/seppevs/migrate-mongo) [![NPM](https://img.shields.io/npm/v/migrate-mongo.svg?style=flat)](https://www.npmjs.org/package/migrate-mongo) [![Downloads](https://img.shields.io/npm/dm/migrate-mongo.svg?style=flat)](https://www.npmjs.org/package/migrate-mongo) [![Dependencies](https://david-dm.org/seppevs/migrate-mongo.svg)](https://david-dm.org/seppevs/migrate-mongo) [![Known Vulnerabilities](https://snyk.io/test/github/seppevs/migrate-mongo/badge.svg)](https://snyk.io/test/github/seppevs/migrate-mongo)
 
+[![tippin.me](https://badgen.net/badge/%E2%9A%A1%EF%B8%8Ftippin.me/@seppevs/F0918E)](https://tippin.me/@seppevs)
+
 migrate-mongo is a database migration tool for MongoDB running in Node.js 
 
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