[improvement] rename packages dir to src (#3659)

src/sku/test/__snapshots__/demo.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders demo correctly 1`] = `
+<div>
+  <div>
+    <div class="sku-container">
+      <!----> <button class="van-button van-button--primary van-button--normal van-button--block"><span class="van-button__text">
+        基础用法
+      </span></button></div>
+  </div>
+  <div>
+    <div class="sku-container">
+      <!----> <button class="van-button van-button--primary van-button--normal van-button--block"><span class="van-button__text">
+        自定义步进器
+      </span></button></div>
+  </div>
+  <div>
+    <div class="sku-container">
+      <!----> <button class="van-button van-button--primary van-button--normal van-button--block"><span class="van-button__text">
+        隐藏售罄规格
+      </span></button></div>
+  </div>
+  <div>
+    <div class="sku-container">
+      <!----> <button class="van-button van-button--primary van-button--normal van-button--block"><span class="van-button__text">
+        高级用法
+      </span></button></div>
+  </div>
+</div>
+`;

src/sku/test/demo.spec.js

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+import Demo from '../demo';
+import demoTest from '../../../test/demo-test';
+
+demoTest(Demo);