Revert "update readme"

This reverts commit e76dfed.

README.md

@@ -1,7 +1,5 @@
 # Vaadin Charts
 
-update readme
-
 > ⚠️ Starting from Vaadin 20, the source code and issues for this component are migrated to the [`vaadin/web-components`](https://github.com/vaadin/web-components/tree/master/packages/vaadin-charts) monorepository.
 > This repository contains the source code and releases of `<vaadin-chart>` for the Vaadin versions 10 to 19.
 
@@ -26,18 +24,15 @@ update readme
 </custom-element-demo>
 ```
 -->
-
 ```html
 <vaadin-chart type="pie">
-  <vaadin-chart-series
-    values='[
+  <vaadin-chart-series values='[
       ["Firefox", 45.0],
       ["IE", 26.8],
       ["Chrome", 12.8],
       ["Safari", 8.5],
       ["Opera", 6.2],
-      ["Others", 0.7]]'
-  >
+      ["Others", 0.7]]'>
   </vaadin-chart-series>
 </vaadin-chart>
 ```
@@ -49,6 +44,7 @@ update readme
 - **Product page** https://vaadin.com/charts
 - **Trial license** https://vaadin.com/pro/licenses
 
+
 ## Installation
 
 Vaadin components are distributed as Bower and npm packages.
@@ -69,11 +65,12 @@ bower i vaadin/vaadin-charts --save
 Once installed, import it in your application:
 
 ```html
-<link rel="import" href="bower_components/vaadin-charts/vaadin-chart.html" />
+<link rel="import" href="bower_components/vaadin-charts/vaadin-chart.html">
 ```
 
 ### Polymer 3 and ES Modules compatible version
 
+
 Install `vaadin-charts`:
 
 ```sh
@@ -83,17 +80,17 @@ npm i @vaadin/vaadin-charts --save
 Once installed, import it in your application:
 
 ```js
-import "@vaadin/vaadin-charts/vaadin-chart.js";
+import '@vaadin/vaadin-charts/vaadin-chart.js';
 ```
 
 ### Install License Key
-
 After one day using Vaadin Charts in a development environment you will see a pop-up that asks you to enter the license key.
 You can get your trial key from [https://vaadin.com/pro/licenses](https://vaadin.com/pro/licenses).
 If the license is valid, it will be saved to the local storage of the browser and you will not see the pop-up again.
 
 [<img src="https://raw.githubusercontent.com/vaadin/vaadin-charts/6.0-preview/screenshot.png" width="400" alt="Screenshot of vaadin-chart">](https://vaadin.com/elements/-/element/vaadin-chart)
 
+
 ## Running demos and tests in browser
 
 1. Fork the `vaadin-charts` repository and clone it locally.
@@ -108,24 +105,28 @@ If the license is valid, it will be saved to the local storage of the browser an
 
 1. You can also open demo or in-browser tests by adding **demo** or **test** to the URL, for example:
 
-- http://127.0.0.1:8080/components/vaadin-charts/demo
-- http://127.0.0.1:8080/components/vaadin-charts/test
+  - http://127.0.0.1:8080/components/vaadin-charts/demo
+  - http://127.0.0.1:8080/components/vaadin-charts/test
+
 
 ## Running tests from the command line
 
 1. When in the `vaadin-charts` directory, run `polymer test`
 
+
 ## Following the coding style
 
 We are using [ESLint](http://eslint.org/) for linting JavaScript code. You can check if your code is following our standards by running `npm run lint`, which will automatically lint all `.js` files as well as JavaScript snippets inside `.html` files.
 
+
 ## Contributing
 
-To contribute to the component, please read [the guideline](https://github.com/vaadin/vaadin-core/blob/master/CONTRIBUTING.md) first.
+  To contribute to the component, please read [the guideline](https://github.com/vaadin/vaadin-core/blob/master/CONTRIBUTING.md) first.
+
 
 ## License
 
 _Vaadin Charts_ is distributed under the terms of
-[Commercial Vaadin Add-On License version 3.0](https://vaadin.com/license/cval-3) ("CVALv3"). A copy of the license is included as `LICENSE.txt` in this software package.
+[Commercial Vaadin Add-On License version 3.0](https://vaadin.com/license/cval-3) ("CVALv3"). A copy of the license is included as ```LICENSE.txt``` in this software package.
 
 Vaadin collects development time usage statistics to improve this product. For details and to opt-out, see https://github.com/vaadin/vaadin-usage-statistics.