docs: add RomainLanz as a contributor (codesandbox#1778)

Adds @RomainLanz as a contributor for code.

This was requested by CompuIves [in this comment](codesandbox#1753 (comment))

Author: allcontributors[bot]

.all-contributorsrc

@@ -1139,6 +1139,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "RomainLanz",
+      "name": "Romain Lanz",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/2793951?v=4",
+      "profile": "https://slynova.io",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoType": "github",