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

src/pull-refresh/test/__snapshots__/demo.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders demo correctly 1`] = `
+<div>
+  <div class="van-pull-refresh">
+    <div class="van-pull-refresh__track" style="transition: 0ms;">
+      <div class="van-pull-refresh__head"></div>
+      <div>
+        <p>刷新次数: 0</p>
+      </div>
+    </div>
+  </div>
+</div>
+`;

src/pull-refresh/test/__snapshots__/index.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`change head content when pulling down 1`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 0ms; transform: translate3d(0,20px, 0);">
+    <div class="van-pull-refresh__head">
+      <div class="van-pull-refresh__text">下拉即可刷新...</div>
+    </div>
+  </div>
+</div>
+`;
+
+exports[`change head content when pulling down 2`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 0ms; transform: translate3d(0,75px, 0);">
+    <div class="van-pull-refresh__head">
+      <div class="van-pull-refresh__text">释放即可刷新...</div>
+    </div>
+  </div>
+</div>
+`;
+
+exports[`change head content when pulling down 3`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 300ms; transform: translate3d(0,50px, 0);">
+    <div class="van-pull-refresh__head">
+      <div class="van-loading van-loading--circular"><span class="van-loading__spinner van-loading__spinner--circular" style="color: rgb(201, 201, 201); width: 16px; height: 16px;"><svg viewBox="25 25 50 50" class="van-loading__circular"><circle cx="50" cy="50" r="20" fill="none"></circle></svg></span><span class="van-loading__text">加载中...</span></div>
+    </div>
+  </div>
+</div>
+`;
+
+exports[`change head content when pulling down 4`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 300ms; transform: translate3d(0,50px, 0);">
+    <div class="van-pull-refresh__head">
+      <div class="van-loading van-loading--circular"><span class="van-loading__spinner van-loading__spinner--circular" style="color: rgb(201, 201, 201); width: 16px; height: 16px;"><svg viewBox="25 25 50 50" class="van-loading__circular"><circle cx="50" cy="50" r="20" fill="none"></circle></svg></span><span class="van-loading__text">加载中...</span></div>
+    </div>
+  </div>
+</div>
+`;
+
+exports[`change head content when pulling down 5`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 300ms;">
+    <div class="van-pull-refresh__head"></div>
+  </div>
+</div>
+`;
+
+exports[`not in page top 1`] = `
+<div class="van-pull-refresh">
+  <div class="van-pull-refresh__track" style="transition: 0ms;">
+    <div class="van-pull-refresh__head"></div>
+  </div>
+</div>
+`;