[chrome-gnome-shell] Update readme

[Yuri Konotopov <ykonotopov src gnome org>]

commit cdd87499d518c3c1f3d8f38d68ce2b7c87be11c1
Author: Yuri Konotopov <ykonotopov gnome org>
Date:   Sun Feb 12 23:07:00 2017 +0400

    Update readme

 README.md |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/README.md b/README.md
index 27a8ea1..49f7ab2 100644
--- a/README.md
+++ b/README.md
@@ -5,13 +5,13 @@ GNOME Shell integration for Chrome
 Introduction
 ------------
 
-This repository contains Web extension for Google Chrome/Chromium, Vivaldi, Opera (and other
-WebExtensions capable browsers) and native host messaging connector that provides integration with
-GNOME Shell and the corresponding extensions repository https://extensions.gnome.org/.
+This repository contains Browser extension for Google Chrome/Chromium, Firefox, Vivaldi, Opera (and other
+Browser Extension, Chrome Extension or WebExtensions capable browsers) and native host messaging connector
+that provides integration with GNOME Shell and the corresponding extensions repository 
https://extensions.gnome.org/.
 
 Requirements
 ------------
- * GNOME Shell up to 3.20
+ * GNOME Shell up to 3.22
  * Python 2.7+ or 3.x
  * PyGObject
  * Python Requests 2.x