Fix clippy lints

src/main.rs

@@ -68,7 +68,7 @@ fn main() -> Result<()> {
         Command::Check(list_options) => Course::check(&list_options)?,
         Command::Meetings(options) => rofi::select_meeting(&options)?,
         Command::ShowConfig => println!("{:?}", *CONFIG),
-        Command::AddMeeting(meeting) => (),
+        Command::AddMeeting(_meeting) => (),
         Command::ShowCurrentCourse => println!("{:?}", Course::current()),
         //Course::current().meetings.push(meeting),
     };

src/rofi.rs

@@ -36,7 +36,7 @@ pub fn select_meeting(options: &ListOptions) -> Result<()> {
         .collect();
     let element = Rofi::new(&meeting_names).run_index()?;
     let mut clip = Command::new("xclip")
-        .args(&["-sel", "clip"])
+        .args(["-sel", "clip"])
         .stdin(Stdio::piped())
         .spawn()
         .expect("Could not spawn xclip process");