message: Fixed CI badge to use CircleCI and added link to bundlephobia.com
diff: # Lightweight Charts
  -[![Build Status](https://travis-ci.com/tradingview/lightweight-charts.svg?branch=master)](https://travis-ci.com/tradingview/lightweight-charts)
  +[![CircleCI](https://img.shields.io/circleci/build/github/tradingview/lightweight-charts.svg)](https://circleci.com/gh/tradingview/lightweight-charts)
  [![npm version](https://badge.fury.io/js/lightweight-charts.svg)](https://www.npmjs.com/package/lightweight-charts)
  -![npm bundle size](https://badgen.net/bundlephobia/minzip/lightweight-charts)
  +[![npm bundle size](https://badgen.net/bundlephobia/minzip/lightweight-charts)](https://bundlephobia.com/result?p=lightweight-charts)
  ![Zero dependencies](https://badgen.net/badge/dependencies/0/green)
  [![Downloads](https://img.shields.io/npm/dm/lightweight-charts.svg)](https://www.npmjs.com/package/lightweight-charts)
  