add: trigger regen on drop

src/server.rs

@@ -36,9 +36,12 @@ impl Server {
         }
     }
 
-    pub fn cleanup(&mut self) -> Result<()> {
-        self.rewriter.cleanup();
-        Ok(())
+    pub fn cleanup(&mut self) -> Result<bool> {
+        let cleaned_up = self.rewriter.cleanup();
+        if cleaned_up {
+            self.generate_config()?;
+        }
+        Ok(cleaned_up)
     }
 
     pub fn register(&mut self, _request: &Request, ip: &str) -> Result<()> {