message: Fix output error messages
diff: @@ -30,7 +30,7 @@ pub enum RunError {
  Trace(String),
  #[fail(display = "Failed to report coverage! Error: {}", _0)]
  CovReport(String),
  - #[fail(display = "Output format {} is currently not supported!", _0)]
  + #[fail(display = "{}", _0)]
  OutFormat(String),
  #[fail(display = "{}", _0)]
  IO(std::io::Error),
  