Improve classification of rust-warp (#5338)

Now it uses Rust as a platform and Hyper as a webserver, just
like other Rust web frameworks based on Hyper.

frameworks/Rust/warp-rust/benchmark_config.json

@@ -13,8 +13,8 @@
         "language": "Rust",
         "flavor": "None",
         "orm": "None",
-        "platform": "Hyper",
-        "webserver": "None",
+        "platform": "Rust",
+        "webserver": "Hyper",
         "os": "Linux",
         "database_os": "Linux",
         "display_name": "warp-rust",