Update renovate-config.json (#18)

Author: vilkinsons

renovate-config.json

@@ -314,6 +314,11 @@
       "groupName": "`dashu` Rust crates",
       "matchPackageNames": ["/^dashu[-_]?/"]
     },
+    {
+      "matchManagers": ["cargo"],
+      "groupName": "`frunk` Rust crates",
+      "matchPackageNames": ["/^frunk[-_]?/"]
+    },
     {
       "matchManagers": ["cargo"],
       "groupName": "`napi` Rust crates",