Fix: Prevent ytdl treating warnings as errors.

Simple enough change to handle this for now, in that it just tells ytdl to silence errors.

Closes #37.

src/input/ytdl_src.rs

@@ -42,6 +42,7 @@ pub(crate) async fn _ytdl(uri: &str, pre_args: &[&str]) -> Result<Input> {
         "infinite",
         "--no-playlist",
         "--ignore-config",
+        "--no-warnings",
         uri,
         "-o",
         "-",
@@ -125,6 +126,7 @@ pub(crate) async fn _ytdl_metadata(uri: &str) -> Result<Metadata> {
         "infinite",
         "--no-playlist",
         "--ignore-config",
+        "--no-warnings",
         uri,
         "-o",
         "-",