update copyright dates and have a single source of truth for the license

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2013 Yamashita, Yuu
+Copyright (c) 2013-2019 Yamashita, Yuu
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

README.rst

@@ -90,26 +90,4 @@ Version History
 License
 -------
 
-(The MIT License)
-
--  Copyright (c) 2013-2015 Yamashita, Yuu
--                2015 Oliver Bestwalter (PyPi support)
-
-| 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.
+MIT - see [License file](LICENSE).