Fix link

README.md

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 [![Build Status](https://travis-ci.org/Polymer/polymer.svg?branch=master)](https://travis-ci.org/Polymer/polymer)
 
-> ℹ️ Note: This is the current stable version of the Polymer library.  At Google I/O 2018 we announced a new Web Component base class, [`LitElement`](https://github.com/PolymerLabs/lit-element), as a successor to the `PolymerElement` base class in the Polymer library, and we recommend new users consider using `LitElement` instead.  The Polymer 3.0 library will be maintained for the foreseeable future, and we recommend existing users of Polymer 2.0 to [migrate](#) elements to 3.0 for best compatibility with the JS ecosystem.  Thanks to the interoperability of Web Components, elements built with Polymer 3.0 and LitElement can be mixed and matched in the same app, so developers can choose to migrate elements from Polymer 3.0 to LitElement incrementally.  See our blog post on the [Polymer Project roadmap](https://www.polymer-project.org/blog/2018-05-02-roadmap-update.html) for more information.
+> ℹ️ Note: This is the current stable version of the Polymer library.  At Google I/O 2018 we announced a new Web Component base class, [`LitElement`](https://github.com/PolymerLabs/lit-element), as a successor to the `PolymerElement` base class in the Polymer library, and we recommend new users consider using LitElement instead.  The Polymer 3.0 library will be maintained for the foreseeable future, and we recommend existing users of Polymer 2.0 to [migrate](#about-polymer-30) elements to 3.0 for best compatibility with the JS ecosystem.  Thanks to the interoperability of Web Components, elements built with Polymer 3.0 and LitElement can be mixed and matched in the same app, so developers can choose to migrate elements from Polymer 3.0 to LitElement incrementally.  See our blog post on the [Polymer Project roadmap](https://www.polymer-project.org/blog/2018-05-02-roadmap-update.html) for more information.
 
 Polymer lets you build encapsulated, reusable [Web Components](https://www.webcomponents.org/introduction) that work just like standard HTML elements, to use in building web applications.  Using a Web Commponent built with Polymer is as simple as importing its definition then using it like any other HTML element: