docs: Improve updating angular cli steps

dmytroyarmak · filipesilva · commit c99a7168d55e · 2017-02-22T11:51:37.000Z
Add step that removes "angular-cli" from "package.json" to make sure that after upgrading from "angular-cli" to "@angular/cli" only "@angular/cli" is installed into "node_modules". It's needed to avoid problems with npm run scripts that uses "ng" command. Otherwise there will be an error ("You have to be inside an angular-cli project in order to use the test command.") when running "npm start", "npm test" or "npm run ng -- ..." commands. Close #4487
diff --git a/README.md b/README.md
@@ -100,11 +100,17 @@ Module    | `ng g module my-module`
 
 ### Updating Angular CLI
 
+If you're using Angular CLI `beta.28` or less, you need to uninstall `angular-cli` package. It should be done due to changing of package's name and scope from `angular-cli` to `@angular/cli`:
+```bash
+npm uninstall -g angular-cli
+npm uninstall --save-dev angular-cli
+```
+
 To update Angular CLI to a new version, you must update both the global package and your project's local package.
 
 Global package:
 ```bash
-npm uninstall -g angular-cli @angular/cli
+npm uninstall -g @angular/cli
 npm cache clean
 npm install -g @angular/cli@latest
 ```
