Improve phrasing

Author: Kam1k4dze

README.md

@@ -2,7 +2,7 @@
 
 SubChat is a command-line and GUI toolset for generating YouTube subtitles from chat logs.
 
-**IMPORTANT:** Currently only desktop browser YouTube is supported.
+**IMPORTANT:** Currently, only YouTube in desktop browsers is supported.
 
 ![Tsoding](example/result.jpg)
 Chat on this screenshot was created entirely using YouTube subtitles.