message: Remove extra 'or' from dev --host help text
diff: @@ -511,7 +511,7 @@ fn run() -> Result<(), failure::Error> {
  )
  .arg(
  Arg::with_name("host")
  - .help("Host to forward or requests to, defaults to the zone of project or to tutorial.cloudflareworkers.com if unauthenticated.")
  + .help("Host to forward requests to, defaults to the zone of project or to tutorial.cloudflareworkers.com if unauthenticated.")
  .short("h")
  .long("host")
  .takes_value(true)
  