[README.md] Update travis CI tld (#27354)

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/ytdl-org/youtube-dl.svg?branch=master)](https://travis-ci.org/ytdl-org/youtube-dl)
+[![Build Status](https://travis-ci.com/ytdl-org/youtube-dl.svg?branch=master)](https://travis-ci.com/ytdl-org/youtube-dl)
 
 youtube-dl - download videos from youtube.com or other video platforms