chore: update LICENSE (MIT)

[Tachi107]

Microprofile has been relicensed under the MIT (Expat) license three years ago in commit 2b64aaa, but the README and the LICENSE file have never been updated to reflect the change

[bgermann]

Actually, the LICENSE file with the Unlicense text was added after the MIT relicensing. So I would guess, the latest version as of now (4.0) licenses the files generally under Unlicense. The demo/ files that have an MIT header are obvously MIT-licensed.

This should really be clarified.

[Tachi107]

Not quite. The main header file is clearly licensed under the MIT:

microprofile/microprofile.h

Lines 2 to 23 in be2441e

	// MIT License
	//
	// Copyright (c) 2019 Jonas Meyer
	//
	// 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.
	// ***********************************************************************

[bgermann]

Yes, that is true for the files with license comment outside the demo dir as well. Those were just an example. However, the files without comment header are not clearly licensed.