message: Fix content links in readme
diff: [![Build Status](https://travis-ci.org/sapientglobalmarkets/react-querybuilder.svg?branch=master)](https://travis-ci.org/sapientglobalmarkets/react-querybuilder)
  [![codecov.io](https://codecov.io/github/sapientglobalmarkets/react-querybuilder/coverage.svg?branch=master)](https://codecov.io/github/sapientglobalmarkets/react-querybuilder?branch=master)
  -- [Getting Started](#Getting-Started)
  -- [Demo](#Demo)
  -- [Usage](#Usage)
  -- [API](#API)
  - - [QueryBuilder](#QueryBuilder)
  - - [formatQuery](#formatQuery)
  -- [Development](#Development)
  - - [Changelog Generation](#Changelog-Generation)
  -- [Credits](#Credits)
  +- [Getting Started](#getting-started)
  +- [Demo](#demo)
  +- [Usage](#usage)
  +- [API](#api)
  + - [QueryBuilder](#querybuilder)
  + - [formatQuery](#formatquery)
  +- [Development](#development)
  + - [Changelog Generation](#changelog-generation)
  +- [Credits](#credits)
  ![Screenshot](_assets/screenshot.png)
  