Add LitElement versions of components (#69)

Co-authored-by: Serhii Kulykov <iamkulykov@gmail.com>

README.md

@@ -14,7 +14,7 @@ The components below are licensed under the Apache License 2.0.
 | Component | Build Status | Polymer 3 (stable) | LitElement (next) |
 |-----------|--------------|--------------------|-------------------|
 | [vaadin-accordion](https://github.com/vaadin/vaadin-accordion) | [![Build Status](https://travis-ci.org/vaadin/vaadin-accordion.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-accordion) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-accordion)](https://www.npmjs.com/package/@vaadin/vaadin-accordion) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-accordion/next)](https://www.npmjs.com/package/@vaadin/vaadin-accordion) |
-| [vaadin-app-layout](https://github.com/vaadin/vaadin-app-layout) | [![Build Status](https://travis-ci.org/vaadin/vaadin-app-layout.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-app-layout) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-app-layout)](https://www.npmjs.com/package/@vaadin/vaadin-app-layout) | [![LitElement wip](https://img.shields.io/badge/LitElement-wip-yellow.svg)](https://github.com/vaadin/vaadin-app-layout/issues/128) |
+| [vaadin-app-layout](https://github.com/vaadin/vaadin-app-layout) | [![Build Status](https://travis-ci.org/vaadin/vaadin-app-layout.svg?branch=next)](https://travis-ci.org/vaadin/vaadin-app-layout) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-app-layout)](https://www.npmjs.com/package/@vaadin/vaadin-app-layout) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-app-layout/next)](https://www.npmjs.com/package/@vaadin/vaadin-app-layout) |
 | [vaadin-button](https://github.com/vaadin/vaadin-button) | [![Build Status](https://travis-ci.org/vaadin/vaadin-button.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-button) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-button)](https://www.npmjs.com/package/@vaadin/vaadin-button) | |
 | [vaadin-checkbox](https://github.com/vaadin/vaadin-checkbox) | [![Build Status](https://travis-ci.org/vaadin/vaadin-checkbox.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-checkbox) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-checkbox)](https://www.npmjs.com/package/@vaadin/vaadin-checkbox) | |
 | [vaadin-combo-box](https://github.com/vaadin/vaadin-combo-box) | [![Build Status](https://travis-ci.org/vaadin/vaadin-combo-box.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-combo-box) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-combo-box)](https://www.npmjs.com/package/@vaadin/vaadin-combo-box) | |
@@ -32,8 +32,8 @@ The components below are licensed under the Apache License 2.0.
 | [vaadin-menu-bar](https://github.com/vaadin/vaadin-menu-bar) | [![Build Status](https://travis-ci.org/vaadin/vaadin-menu-bar.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-menu-bar) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-menu-bar)](https://www.npmjs.com/package/@vaadin/vaadin-menu-bar) | |
 | [vaadin-notification](https://github.com/vaadin/vaadin-notification) | [![Build Status](https://travis-ci.org/vaadin/vaadin-notification.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-notification) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-notification)](https://www.npmjs.com/package/@vaadin/vaadin-notification) | |
 | [vaadin-ordered-layout](https://github.com/vaadin/vaadin-ordered-layout) | [![Build Status](https://travis-ci.org/vaadin/vaadin-ordered-layout.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-ordered-layout) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-ordered-layout)](https://www.npmjs.com/package/@vaadin/vaadin-ordered-layout) | |
-| [vaadin-progress-bar](https://github.com/vaadin/vaadin-progress-bar) | [![Build status](https://travis-ci.org/vaadin/vaadin-progress-bar.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-progress-bar) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-progress-bar)](https://www.npmjs.com/package/@vaadin/vaadin-progress-bar) | |
-| [vaadin-radio-button](https://github.com/vaadin/vaadin-radio-button) | [![Build status](https://travis-ci.org/vaadin/vaadin-radio-button.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-radio-button) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-radio-button)](https://www.npmjs.com/package/@vaadin/vaadin-radio-button) | [![LitElement planned](https://img.shields.io/badge/LitElement-planned-salmon.svg)](https://github.com/vaadin/vaadin-radio-button/issues/130) |
+| [vaadin-progress-bar](https://github.com/vaadin/vaadin-progress-bar) | [![Build status](https://travis-ci.org/vaadin/vaadin-progress-bar.svg?branch=next)](https://travis-ci.org/vaadin/vaadin-progress-bar) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-progress-bar)](https://www.npmjs.com/package/@vaadin/vaadin-progress-bar) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-progress-bar/next)](https://www.npmjs.com/package/@vaadin/vaadin-progress-bar) |
+| [vaadin-radio-button](https://github.com/vaadin/vaadin-radio-button) | [![Build status](https://travis-ci.org/vaadin/vaadin-radio-button.svg?branch=next)](https://travis-ci.org/vaadin/vaadin-radio-button) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-radio-button)](https://www.npmjs.com/package/@vaadin/vaadin-radio-button) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-radio-button/next)](https://www.npmjs.com/package/@vaadin/vaadin-radio-button) |
 | [vaadin-select](https://github.com/vaadin/vaadin-select) | [![Build status](https://travis-ci.org/vaadin/vaadin-select.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-select) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-select)](https://www.npmjs.com/package/@vaadin/vaadin-select) | |
 | [vaadin-split-layout](https://github.com/vaadin/vaadin-split-layout) | [![Build status](https://travis-ci.org/vaadin/vaadin-split-layout.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-split-layout) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-split-layout)](https://www.npmjs.com/package/@vaadin/vaadin-split-layout) | |
 | [vaadin-tabs](https://github.com/vaadin/vaadin-tabs) | [![Build Status](https://travis-ci.org/vaadin/vaadin-tabs.svg?branch=master)](https://travis-ci.org/vaadin/vaadin-tabs) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-tabs)](https://www.npmjs.com/package/@vaadin/vaadin-tabs) | [![npm version](https://badgen.net/npm/v/@vaadin/vaadin-tabs/next)](https://www.npmjs.com/package/@vaadin/vaadin-tabs) |