feat: add -yflag alias for download command

src/bin/download.rs

@@ -12,7 +12,7 @@ fn parse_args() -> Result<Args, pico_args::Error> {
     let mut args = pico_args::Arguments::from_env();
     Ok(Args {
         day: args.free_from_str()?,
-        year: args.opt_value_from_str("--year")?,
+        year: args.opt_value_from_str(["-y", "--year"])?,
     })
 }