Add a nice header picture to the readme (#159)

Author: stipsan

README.md

@@ -1,4 +1,6 @@
-# scroll-into-view-if-needed · [![CircleCI Status](https://img.shields.io/circleci/project/github/stipsan/scroll-into-view-if-needed.svg?style=flat-square)](https://circleci.com/gh/stipsan/scroll-into-view-if-needed) [![npm stat](https://img.shields.io/npm/dm/scroll-into-view-if-needed.svg?style=flat-square)](https://npm-stat.com/charts.html?package=scroll-into-view-if-needed) [![npm version](https://img.shields.io/npm/v/scroll-into-view-if-needed.svg?style=flat-square)](https://www.npmjs.com/package/scroll-into-view-if-needed) [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
+[![CircleCI Status](https://img.shields.io/circleci/project/github/stipsan/scroll-into-view-if-needed.svg?style=flat-square)](https://circleci.com/gh/stipsan/scroll-into-view-if-needed) [![npm stat](https://img.shields.io/npm/dm/scroll-into-view-if-needed.svg?style=flat-square)](https://npm-stat.com/charts.html?package=scroll-into-view-if-needed) [![npm version](https://img.shields.io/npm/v/scroll-into-view-if-needed.svg?style=flat-square)](https://www.npmjs.com/package/scroll-into-view-if-needed) [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
+![scroll-into-view-if-needed](https://user-images.githubusercontent.com/81981/36357426-2f0f3152-14fe-11e8-892a-915d06488171.png)
+
 
 This is a [ponyfill](https://ponyfill.com) with the added ability of animating
 the scroll itself.