Update README.md

Author: fzaninotto

README.md

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 # json-graphql-server
- ![travis (.org)](https://img.shields.io/travis/marmelab/json-graphql-server.svg) ![github top language](https://img.shields.io/github/languages/top/marmelab/json-graphql-server.svg) ![David. dependencies](https://david-dm.org/marmelab/json-graphql-server.svg) ![npm](https://img.shields.io/npm/v/json-graphql-server.svg) ![github contributors](https://img.shields.io/github/contributors/marmelab/json-graphql-server.svg) ![license](https://img.shields.io/github/license/marmelab/json-graphql-server.svg) ![prs welcome](https://img.shields.io/badge/prs-welcome-brightgreen.svg)
+![github top language](https://img.shields.io/github/languages/top/marmelab/json-graphql-server.svg) ![npm](https://img.shields.io/npm/v/json-graphql-server.svg) ![github contributors](https://img.shields.io/github/contributors/marmelab/json-graphql-server.svg) ![license](https://img.shields.io/github/license/marmelab/json-graphql-server.svg) ![prs welcome](https://img.shields.io/badge/prs-welcome-brightgreen.svg)
 
 Get a full fake GraphQL API with zero coding in less than 30 seconds.