License updated in the Readme.

README.md

 
 [![Build Status](https://travis-ci.org/offa/scope-guard.svg?branch=master)](https://travis-ci.org/offa/scope-guard)
 [![GitHub release](https://img.shields.io/github/release/offa/scope-guard.svg)](https://github.com/offa/scope-guard/releases)
-[![License](https://img.shields.io/badge/license-GPLv3-yellow.svg)](LICENSE)
+[![License](https://img.shields.io/badge/license-MIT-yellow.svg)](LICENSE)
 ![C++](https://img.shields.io/badge/c++-17-green.svg)
 
 Implementation of *Scope Guards* (`scope_exit`, `scope_success`, `scope_fail`) and `unique_resource` as proposed in [**P0052R8**][2] (former [N3949][1]).
 
 ## License
 
-**GNU General Public License (GPL)**
+**MIT License**
 
-    This program 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.
+    Copyright (c) 2017-2018 offa
 
-    This program 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.
+    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:
 
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    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.
 
 
 [1]: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3949.pdf