Change license and copyright to the same as go-mode.el

Large portions of rubocopfmt.el is based on code from go-mode.el. As
such rubocopfmt.el should really carry the same license and copyright
as go-mode.el does.

README.md

@@ -35,27 +35,6 @@ To enable formatting `ruby-mode` buffers with rubocopfmt on save, simply enable
 - `rubocopfmt` - Format current buffer with rubocopfmt.
 - `rubocopfmt-mode` - Toggle formatting on save on/off.
 
-## License
-
-Copyright (C) 2017 Jim Myhrberg
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
 
 [rubocopfmt]: https://github.com/jimeh/rubocopfmt
 [go-mode]: https://github.com/dominikh/go-mode.el