docs: add JaxCavalera as a contributor (#232)

* docs: update README.md

* docs: update .all-contributorsrc


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

Author: allcontributors[bot]

.all-contributorsrc

@@ -518,6 +518,15 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "JaxCavalera",
+      "name": "JaxCavalera",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/15429762?v=4",
+      "profile": "https://github.com/JaxCavalera",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }