docs: add chander as a contributor (#657)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -666,6 +666,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "chander",
+      "name": "Chander Ganesan",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/671887?v=4",
+      "profile": "http://www.gridgeo.com",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -159,6 +159,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/dhet"><img src="https://avatars3.githubusercontent.com/u/2668621?v=4" width="100px;" alt=""/><br /><sub><b>David H.</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=dhet" title="Code">💻</a></td>
+    <td align="center"><a href="http://www.gridgeo.com"><img src="https://avatars1.githubusercontent.com/u/671887?v=4" width="100px;" alt=""/><br /><sub><b>Chander Ganesan</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=chander" title="Documentation">📖</a></td>
   </tr>
 </table>