docs(readme): update maintainers to admin team

Author: joshwiens

README.md

@@ -8,7 +8,7 @@
 <div align="center">
   <a href="https://github.com/webpack/webpack">
     <img width="200" height="200"
-      src="https://webpack.js.org/assets/icon-square-big.svg">
+      src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon.svg">
   </a>
   <h1>Url Loader</h1>
 </div>
@@ -51,26 +51,34 @@ Don't hesitate to create a pull request. Every contribution is appreciated. In d
   <tbody>
     <tr>
       <td align="center">
-        <img width="150 height="150"
-        src="https://avatars.githubusercontent.com/sokra?v=3">
-        <br />
-        <a href="https://github.com/">Tobias Koppers</a>
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/166921?v=3&s=150">
+        </br>
+        <a href="https://github.com/bebraw">Juho Vepsäläinen</a>
       </td>
       <td align="center">
-        <img width="150 height="150"
-        src="https://avatars.githubusercontent.com/SpaceK33z?v=3">
-        <br />
-        <a href="https://github.com/">Kees Kluskens</a>
+        <img width="150" height="150"
+        src="https://avatars2.githubusercontent.com/u/8420490?v=3&s=150">
+        </br>
+        <a href="https://github.com/d3viant0ne">Joshua Wiens</a>
       </td>
-    <tr>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/533616?v=3&s=150">
+        </br>
+        <a href="https://github.com/SpaceK33z">Kees Kluskens</a>
+      </td>
+      <td align="center">
+        <img width="150" height="150"
+        src="https://avatars3.githubusercontent.com/u/3408176?v=3&s=150">
+        </br>
+        <a href="https://github.com/TheLarkInn">Sean Larkin</a>
+      </td>
+    </tr>
   <tbody>
 </table>
 
 
-<h2 align="center">LICENSE</h2>
-
-MIT
-
 [npm]: https://img.shields.io/npm/v/url-loader.svg
 [npm-url]: https://npmjs.com/package/url-loader