docs: update .all-contributorsrc [skip ci]

.all-contributorsrc

@@ -355,6 +355,15 @@
       "contributions": [
         "design"
       ]
+    },
+    {
+      "login": "Zipexpo",
+      "name": "nvtngan",
+      "avatar_url": "https://avatars.githubusercontent.com/u/18387748?v=4",
+      "profile": "http://www.myweb.ttu.edu/ngu00336/",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,