Add hCaptcha support.

src/routes/root.rs

@@ -1,16 +1,20 @@
 use super::Response;
 
 use mongodb::bson::doc;
+use std::env;
 
 /// root
 #[get("/")]
 pub fn root() -> Response {
     Response::Success(json!({
-        "revolt": "0.2.8",
+        "revolt": "0.2.9",
         "version": {
             "major": 0,
             "minor": 2,
-            "patch": 8
+            "patch": 9
+        },
+        "features": {
+            "captcha": env::var("HCAPTCHA_KEY").is_ok()
         }
     }))
 }