message: Flush on history print.
diff: @@ -19,6 +19,7 @@ use std::{
  cell::RefCell,
  fs::{self, OpenOptions},
  io,
  + io::Write,
  path::Path,
  rc::Rc,
  };
  @@ -186,9 +187,9 @@ impl<'a> InteractiveShell<'a> {
  }
  None => {
  print!("{}", context_bis.borrow().history.buffers.iter().format("\n"));
  - /*io::stdout().flush().unwrap_or_else(|err| {
  + io::stdout().flush().unwrap_or_else(|err| {
  eprintln!("ion: history print: {}", err);
  - });*/
  + });
  }
  }
  Status::SUCCESS
  