docs: add spencerc99 as a contributor for bug (#527)

* 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

@@ -259,6 +259,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "spencerc99",
+      "name": "Spencer Chang",
+      "avatar_url": "https://avatars.githubusercontent.com/u/14796580?v=4",
+      "profile": "http://spencerchang.me",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "contributorsPerLine": 7,