only keep last 10 episodes; Fixes #7

src/lib.rs

@@ -29,9 +29,16 @@ impl Feed {
             }
         }
 
+        self.only_keep_last_episodes();
+
         Ok(())
     }
 
+    fn only_keep_last_episodes(&mut self) {
+        self.episodes = self.episodes.clone().into_iter().rev().take(10).collect();
+        // only keep last 10
+    }
+
     fn has_broadcast_url(&self, url: &str) -> bool {
         self.episodes.iter().any(|e| e.url == url)
     }