docs: add hx2A as a contributor (#462)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -460,6 +460,17 @@
         "example",
         "test"
       ]
+    },
+    {
+      "login": "hx2A",
+      "name": "Jim",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/4044283?v=4",
+      "profile": "http://ixora.io",
+      "contributions": [
+        "example",
+        "doc",
+        "content"
+      ]
     }
   ],
   "contributorsPerLine": 7,