✨ update shape-only preview html

index.html

@@ -47,7 +47,8 @@
 	  <a href="https://github.com/pyecharts/echarts-china-cities-js"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/652c5b9acfaddf3a9c326fa6bde407b87f7be0f4/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6f72616e67655f6666373630302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_orange_ff7600.png"></a>
       <div class="my-block">
 		<div class="inner-block">
-		  <span class="big"><a href="preview.html">Preview</a> 370 Chinese city maps (12MB in total)</span><p>
+			<span class="big">Preview 370 Chinese city maps (12MB in total)</span><p>
+			<span class="medium"><a href="preview.html">with internal borders</a> or <a href="shape-only-preview.html">shape-only</a>
 			<a class="github-button" href="https://github.com/pyecharts/echarts-china-cities-js/fork" data-icon="octicon-repo-forked" data-size="large" data-show-count="true" aria-label="Fork pyecharts/echarts-china-cities-js on GitHub">Fork</a>
 			<a class="github-button" href="https://github.com/pyecharts/echarts-china-cities-js" data-icon="octicon-star" data-size="large" data-show-count="true" aria-label="Star pyecharts/echarts-china-cities-js on GitHub">Star</a><p>
 			<span class="medium">https://github.com/pyecharts/echarts-china-cities-js</span>