Removes circleci pipeline

Author: tsov

.circleci/config.yml

@@ -1,4 +1,3 @@
-[![CircleCI](https://circleci.com/gh/Shopify/draggable/tree/master.svg?style=shield)](https://circleci.com/gh/Shopify/draggable/tree/master)
 [![npm version](https://badge.fury.io/js/%40shopify%2Fdraggable.svg)](https://badge.fury.io/js/%40shopify%2Fdraggable)
 [![codecov](https://codecov.io/gh/Shopify/draggable/branch/master/graph/badge.svg)](https://codecov.io/gh/Shopify/draggable)
 [![Greenkeeper badge](https://badges.greenkeeper.io/Shopify/draggable.svg)](https://greenkeeper.io/)