Chore: update sponsors on README

README.md

@@ -47,6 +47,11 @@
           <img width="150px" src="https://user-images.githubusercontent.com/1016365/34124854-48fafa06-e3e9-11e7-8c04-251055feebee.png">
         </a>
       </td>
+      <td align="center" valign="middle">
+        <a href="https://www.duotai.cn/?utm_source=element" target="_blank">
+          <img width="150px" src="https://user-images.githubusercontent.com/10095631/39403151-c42dbcee-4ba5-11e8-9c09-8e5283da4144.png">
+        </a>
+      </td>
       <td align="center" valign="middle">
         <a href="https://www.duohui.cn/?utm_source=element&utm_medium=web&utm_campaign=element-index" target="_blank">
           <img width="150px" src="https://user-images.githubusercontent.com/10095631/35603534-bb24470c-0678-11e8-8bcc-17ceaef8cbef.png">