docs: add JABedford as a contributor (codesandbox#1955)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -1207,6 +1207,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "JABedford",
+      "name": "James Bedford",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/32302360?v=4",
+      "profile": "http://www.dopest.tech",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoType": "github",