docs: add @matheo as a contributor

Author: netanel basal

.all-contributorsrc

@@ -453,6 +453,15 @@
         "code",
         "doc"
       ]
+    },
+    {
+      "login": "matheo",
+      "name": "Mateo Tibaquirá",
+      "avatar_url": "https://avatars.githubusercontent.com/u/260185?v=4",
+      "profile": "http://matheo.co/",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }