docs: add Streamfizz to "They use HLS.js in production!"

Streamfizz (https://streamfizz.fr) is a French B2B video platform that
uses hls.js in production for HLS playback in its video player.

Author: Geoffrey Signorato

README.md

@@ -482,6 +482,7 @@ The following players integrate HLS.js for HLS playback:
 |                          [<img src="https://showmax.akamaized.net/e/logo/showmax_black.png" width="120">](https://tech.showmax.com)                          | [<img src="https://static3.1tv.ru/assets/web/logo-ac67852f1625b338f9d1fb96be089d03557d50bfc5790d5f48dc56799f59dec6.svg" width="120" height="120">](https://www.1tv.ru/) |       [<img src="https://user-images.githubusercontent.com/1480052/40482633-c013ebce-5f55-11e8-96d5-b776415de0ce.png" width="120">](https://www.zdf.de)        |                                                                  [<img src="https://cms-static.brid.tv/img/brid-logo-120x120.jpg" width="120">](https://www.brid.tv/)                                                                   |
 |                                                            [cdn77](https://streaming.cdn77.com/)                                                             |                                  [<img src="https://avatars0.githubusercontent.com/u/7442371?s=200&v=4" width="120">](https://r7.com/)                                  | [<img src="https://raw.githubusercontent.com/Novage/p2p-media-loader/gh-pages/images/p2pml-logo.png" width="120">](https://github.com/Novage/p2p-media-loader) |                                                              [<img src="https://avatars3.githubusercontent.com/u/45617200?s=400" width="120">](https://kayosports.com.au)                                                               |
 |    [<img src="https://avatars1.githubusercontent.com/u/5279615?s=400&u=9771a216836c613f1edf4afe71cfc69d4c5657ed&v=4" width="120">](https://flosports.tv)     |                  [<img src="https://www.logolynx.com/images/logolynx/c6/c67a2cb3ad33a82b5518f8ad8f124703.png" width="120">](https://global.axon.com/)                   |                    [<img src="https://static.rutube.ru/static/img/svg/logo_rutube_black_color_154x25.svg" width="120">](https://rutube.ru/)                    |                                                 [<img src="https://raw.githubusercontent.com/aaskaoui/labra-flex-assets/master/labra-flex.png" width="120">](https://labra-flex.world/)                                                 |
+| [<img src="https://store-prod.b-cdn.net/logo/streamfizz.png" width="120">](https://streamfizz.fr) |  |  |  |
 
 ## Chrome/Firefox integration