docs: credit Peter deHaan as contributor

.all-contributorsrc

@@ -305,6 +305,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "pdehaan",
+      "name": "Peter deHaan",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/557895?v=4",
+      "profile": "http://about.me/peterdehaan",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -99,6 +99,7 @@ Want to contribute? see [Contribution Guidelines][contribution]. Thanks goes to
     <td align="center"><a href="https://ciccarello.me"><img src="https://avatars0.githubusercontent.com/u/11273838?v=4" width="100px;" alt=""/><br /><sub><b>Anthony Ciccarello</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=aciccarello" title="Documentation">📖</a></td>
     <td align="center"><a href="https://twitter.com/IAmTrySound"><img src="https://avatars0.githubusercontent.com/u/5635476?v=4" width="100px;" alt=""/><br /><sub><b>Bogdan Chadkin</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=TrySound" title="Code">💻</a></td>
     <td align="center"><a href="https://hightouch.io"><img src="https://avatars0.githubusercontent.com/u/5959235?v=4" width="100px;" alt=""/><br /><sub><b>Tejas Manohar</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=tejasmanohar" title="Code">💻</a></td>
+    <td align="center"><a href="http://about.me/peterdehaan"><img src="https://avatars2.githubusercontent.com/u/557895?v=4" width="100px;" alt=""/><br /><sub><b>Peter deHaan</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=pdehaan" title="Documentation">📖</a></td>
   </tr>
 </table>