docs: add NMinhNguyen as a contributor (#397)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -783,6 +783,15 @@
       "contributions": [
         "platform"
       ]
+    },
+    {
+      "login": "NMinhNguyen",
+      "name": "Minh Nguyen",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/2852660?v=4",
+      "profile": "https://twitter.com/minh_ngvyen",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,