Remove "uninstall old cli", does more harm than good

It seems some people don't see "uninstall" and actually install old CLI.
As the old cli is very old, probably noone will have it installed now.

README.md

@@ -57,8 +57,6 @@ Getting Amber and setting up an initial project
 
 Do this to install Amber
 
-	# In case you have installed older package `amber-cli`, uninstall it.
-	npm uninstall -g amber-cli
     # Install the CLI tool `@ambers/cli` and supporting tools
     npm install -g grunt-cli grunt-init @ambers/cli