Update README.md

Author: kolarski

README.md

@@ -21,18 +21,3 @@ install that via:
 Then, go ahead and download the element's dependencies:
 
     bower install
-
-## Playing With Your Element
-
-If you wish to work on your element in isolation, we recommend that you use
-[Polyserve](https://github.com/PolymerLabs/polyserve) to keep your element's
-bower dependencies in line. You can install it via:
-
-    npm install -g polyserve
-
-And you can run it via:
-
-    polyserve
-
-Once running, you can preview your element at
-`http://localhost:8080/components/select2-wrapper/`, where `select2-wrapper` is the name of the directory containing it.