Remove erronous GPL license header
-// Copyright (C) 2020 Kevin Dc
-//
-// This file is part of nushell.
-//
-// nushell is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// nushell is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with nushell. If not, see <http://www.gnu.org/licenses/>.
-
use std::io;
use std::path::{Component, Path, PathBuf};
