message: Remove periods from error messages
diff: @@ -291,7 +291,7 @@ fn rustc(cx: &mut Context<'_, '_>, unit: &Unit, exec: &Arc<dyn Executor>) -> Car
  &mut |line| on_stderr_line(state, line, package_id, &target, &mut output_options),
  )
  .map_err(verbose_if_simple_exit_code)
  - .chain_err(|| format!("could not compile `{}`.", name))?;
  + .chain_err(|| format!("could not compile `{}`", name))?;
  }
  if rustc_dep_info_loc.exists() {
  @@ -614,7 +614,7 @@ fn rustdoc(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<Work> {
  &mut |line| on_stderr_line(state, line, package_id, &target, &mut output_options),
  false,
  )
  - .chain_err(|| format!("could not document `{}`.", name))?;
  + .chain_err(|| format!("could not document `{}`", name))?;
  Ok(())
  }))
  }
  