fix --automove before input file

src/main.rs

@@ -75,6 +75,7 @@ fn main() {
                      .long("automove")
                      .value_name("ENTRY=VIDEOTIME")
                      .multiple(true)
+                     .number_of_values(1)
                      .help("Move subtitles starting at a given time or index to align with \
                      a matching audio track time. This argument can be given multiple times. \
                      Some subtitles may be dropped if they fall outside the timeline after \