clippy fix

src/subscriptions.rs

@@ -7,13 +7,11 @@ pub fn lines_from(file_name: &str) -> Result<Vec<String>> {
     let file = File::open(file_name)?;
     let reader = BufReader::new(file);
     let mut lines = vec![];
-    for line in reader.lines() {
-        if let Ok(line) = line {
+    for line in reader.lines().flatten() {
         if line.starts_with('@') {
             lines.push(line);
         }
     }
-    }
     Ok(lines)
 }