Fix license

Author: paulmillr

Diff for: README.md

@@ -479,28 +479,10 @@ Copyright (c) 2021 Patricio Palladino, Paul Miller, ethereum-cryptography contri
 See [LICENSE](./LICENSE) file.
 
 `hdkey` is loosely based on [hdkey](https://github.com/cryptocoinjs/hdkey),
-which has [MIT License](https://github.com/cryptocoinjs/hdkey/blob/3f3c0b5cedb98f971835b5116ebea05b3c09422a/LICENSE)
+which had [MIT License](https://github.com/cryptocoinjs/hdkey/blob/3f3c0b5cedb98f971835b5116ebea05b3c09422a/LICENSE)
 
 Copyright (c) 2018 cryptocoinjs
 
-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.
-
 [1]: https://img.shields.io/npm/v/ethereum-cryptography.svg
 [2]: https://www.npmjs.com/package/ethereum-cryptography
 [3]: https://img.shields.io/travis/ethereum/js-ethereum-cryptography/master.svg?label=Travis%20CI