Updated installation instructions

Author: sergeche

README.md

@@ -7,9 +7,8 @@ Emmet is a web-developer’s toolkit that can greatly improve your HTML & CSS wo
 ## Installation ##
 
 1. Run Brackets.
-2. Select _File > Extension Manager..._ and click _Install from URL..._
-3. Enter `https://github.com/emmetio/brackets-emmet` as _Extension URL_.
-4. Click _Install_ to begin downloading and installing the extension.
+2. Select _File > Extension Manager..._
+3. Find “Emmet” extension and click “Install” button
 
 ### Manual instalation