README: update list of companies using flashls

center columns
related to #459

README.md

@@ -242,7 +242,7 @@ After a successful build you will find fresh binaries in the `bin/debug` and `bi
 
 
 |Logo|Company|
-|---|---|---|
+|:-:|:-:|
 |<img src="https://s3.amazonaws.com/BURC_Pages/downloads/a-smile_color.jpg" width="80">   |   [Amazon](http://www.amazon.com)|
 |<img src="https://bitdash-a.akamaihd.net/webpages/bitmovin-logo.png" width="160">   |[Bitmovin](http://www.bitmovin.com)|
 |<img src="http://press.dailymotion.com/fr/wp-content/uploads/sites/4/2010/06/LOGO-PRESS-BLOG.png" width="80">   |[Dailymotion](http://www.dailymotion.com)|