Feature request summary
When the output format is CSV, the report has a row for each individual metric. However, it does not include the overall category score. In case I'm using the wrong term here, the following screenshot shows what I'm calling the "overall category score".
<img width="1867" alt="Screen Shot 2020-09-08 at 5 15 43 PM" src="https://user-images.githubusercontent.com/1728139/

Some prior art here:

https://github.com/puppeteer/examples/blob/master/verify_sw_caching.js
https://michaljanaszek.com/blog/test-website-performance-with-puppeteer/#cacheAndServiceWorker

各位好，

• 非常开心大家对于crawlergo的认可，但目前由于本人工作原因，可能无法及时的去挨个实现大家的需求，我会利用空余时间去实现比较有价值的特性和一些比较严重的BUG，更新速度可能是以月为单位，还请各位见谅。
• 有一些常见问题之前的issue已经提到并解决，大家在提新的issue时，请先看看closed
  的issue，说不定能找到解决办法。

@9ian1i

An improve to the layout of the devtool could definitely improve user experience. Lets make sure the devtool is utilizing the space better.