docs: update readme

Author: Justineo

README.md

@@ -237,7 +237,7 @@ Drop `<script>` inside your HTML file and access the component via `window.VueEC
 ```html
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
-<script src="https://cdn.jsdelivr.net/npm/[email protected].3"></script>
+<script src="https://cdn.jsdelivr.net/npm/[email protected].4"></script>
 ```
 <!-- vue3Scripts:end -->
 
@@ -257,7 +257,7 @@ app.component('v-chart', VueECharts)
 ```html
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
-<script src="https://cdn.jsdelivr.net/npm/[email protected].3"></script>
+<script src="https://cdn.jsdelivr.net/npm/[email protected].4"></script>
 ```
 <!-- vue2Scripts:end -->
 

README.zh-Hans.md

@@ -237,7 +237,7 @@ import "echarts";
 ```html
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
-<script src="https://cdn.jsdelivr.net/npm/[email protected].3"></script>
+<script src="https://cdn.jsdelivr.net/npm/[email protected].4"></script>
 ```
 <!-- vue3Scripts:end -->
 
@@ -257,7 +257,7 @@ app.component('v-chart', VueECharts)
 ```html
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
 <script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
-<script src="https://cdn.jsdelivr.net/npm/[email protected].3"></script>
+<script src="https://cdn.jsdelivr.net/npm/[email protected].4"></script>
 ```
 <!-- vue2Scripts:end -->